50′ Luxury Yacht. Private Full or Half Day Catamaran Snorkel, & Beach Experience

The best part of this St. Thomas outing is control: you and your captain shape the day instead of following a fixed boat route. On the 50-foot SY Sirena, you can string together quiet coves, turtle-friendly snorkeling spots, and beach time around St. Thomas, St. John, and nearby cays.

I like the private boat for up to 12 people, which can make the $1,595 group price sensible for a family or friend group. I also like the comfortable layout, with a shaded salon, broad back deck, bean bags, and forward trampolines. The main catch is that the advertised beach menu is not a guarantee. Commercial access rules can affect stops such as Trunk Bay, so confirm your plan before departure.

Key details before you book

• A private 50-foot catamaran: Your group has the yacht to itself, with room to spread out rather than sharing a crowded excursion boat.
• Half-day or full-day flexibility: The charter runs about four to seven hours, with time planned around your interests.
• Snorkeling gear and floats included: You also get bottled water, soda, beer, rum punch, and an onboard restroom.
• Captain-led route planning: Captains such as Maddie, JW, Alex, Dave, and Vic have helped groups find turtles, stingrays, octopus, tropical fish, and calm water.
• Lunch and gratuity cost extra: You can buy lunch at some stops, but food is not included, and a 15 to 20 percent tip is customary for exceptional service.
• BVI trips are not included: This boat visits St. Thomas, St. John, and nearby cays. The British Virgin Islands require a different booking.

What a private day aboard SY Sirena feels like

You meet at American Yacht Harbor in Red Hook, on the east side of St. Thomas. The boat returns there at the end of the charter. Pickup at Cruz Bay on St. John may be possible with advance notice after booking, but you should arrange that ahead of time rather than assume it is included.

The SY Sirena is a 50-foot catamaran with a useful mix of social and quiet spaces. The salon opens onto a large aft deck with seating and dining space. Up front, bean bags and trampolines give you a place to stretch out while underway, watch for turtles and dolphins, or simply enjoy the breeze.

That layout matters. On a smaller boat, everyone tends to sit in one place. Here, children can move between shaded and open areas, some people can relax while others prepare to snorkel, and a group of 12 does not have to spend the whole day shoulder to shoulder.

The crew supplies snorkeling equipment and floats. Water comes in reusable or eco-minded service from Virgin H2O, and you receive soda, beer, and the company’s signature rum punch. You also have an onboard restroom, a practical feature on a four to seven-hour outing.

The price is for the boat and group, not per person. At $1,595 for up to 12 people, the math is strongest with a larger party. Twelve people would bring the base cost to roughly $133 per person before gratuity and any lunch. A group of four pays nearly $399 per person, so a small party should compare this with a shared sailing trip.

How the captain shapes your route

The itinerary is best understood as a list of possible stops, not a promise to visit every beach. A half-day charter cannot realistically spend 90 minutes at each of the 13 listed locations, and even a full day requires choices.

Your captain will ask what matters most. You might focus on snorkeling and sea life, favor quiet swimming coves, seek a scenic cruise around St. John, or build in time for lunch. Good planning is important because every extra crossing uses time that could otherwise be spent in the water.

The crew has adapted routes for changing conditions. One family found calm areas during a windy week, while other groups used captain suggestions to locate turtles, stingrays, octopus, and fish. That is one of the strongest reasons to choose a private charter: the route can shift toward sheltered water if the wind picks up.

I would decide on two or three priorities before you arrive. For example: turtles first, a beach stop second, and lunch third. That gives the captain useful direction without turning the day into a rigid schedule.

St. Thomas beaches and coves on the menu

Secret Harbour is a practical choice for a relaxed opening stop. It offers a cove setting and can work well when your group wants to ease into the day with swimming or snorkeling. Allow about 90 minutes if you want time to get equipment on, explore, and dry off before moving on.

Brewer’s Bay is on St. Thomas’s western side and gives you another possible swimming and snorkeling setting. Its value depends on the day’s wind and sea conditions. If the water is unsettled elsewhere, your captain may favor a more protected location instead.

Magens Bay Beach is one of St. Thomas’s best-known beach scenes, with a broad curve of sand and striking surroundings. It is a good choice if your group wants classic beach scenery as well as time in the water. The tradeoff is that a famous beach may not feel as quiet as a smaller cove.

Sapphire Beach can combine swimming, snorkeling, and a pleasant view across the water. It is a sensible option for a group that wants a beach stop without spending the entire charter at sea. Ask the captain how much time remains for snorkeling before committing to a longer shore break.

Coki Point Beach is associated with easy access to the water and lively beach activity. It can suit a group that wants a more social shore stop, though it may not be your first choice if peace and privacy are the goal.

Lindqvist Beach offers a more low-key beach setting. It is a useful option for a group that wants sand and swimming without building the entire day around a major resort beach.

St. John’s best-known bays and snorkeling water

Crossing toward St. John opens up a different feel, with more coves and small islands to consider. The route takes time, so St. John is usually a better focus for a full-day charter than a short afternoon.

Honeymoon Beach is a natural fit for easy swimming and a laid-back beach break. It can work especially well for families who want a clear change of pace after snorkeling.

Francis Bay gives you another broad, scenic St. John option. The bay can suit groups that want room to swim and relax rather than rush between several small stops.

Trunk Bay Beach is perhaps the most recognizable name on the list, thanks in part to its famous underwater snorkeling trail. But do not build your entire plan around it without checking first. Commercial charter access can be restricted, and the captain may not be able to stop there even though it appears among the possible destinations.

Maho Bay Beach is a strong choice for people hoping to see sea turtles. Several successful outings have included turtles in this part of the islands, although no captain can promise wildlife sightings. Bring patience, move calmly in the water, and let the crew point out good areas.

Waterlemon Cay is a popular St. John snorkeling target, with a small-island setting that makes the trip feel more adventurous. It requires sensible timing, since reaching the cay and enjoying it properly can take a significant part of the charter.

Scott Bay Beach and Hansen Bay Beach offer additional St. John possibilities. These locations are useful when the captain is balancing your wishes with wind, water conditions, boat traffic, and the time needed to return to Red Hook.

What you may see in the water

The strongest activity reports center on sea life. Groups have encountered sea turtles, stingrays, octopus, tropical fish, and even a sunken ship. Those sightings are never guaranteed, but the private format gives the crew more freedom to look for suitable water instead of following a fixed group schedule.

The crew also helps with the practical side of snorkeling. First mates such as Olivia, Ro, Coleman, Celina, Kahlia, and Yousif have been praised for fitting equipment, handling floats, keeping drinks available, and helping people in and out of the water.

That support matters for mixed-age groups. One family with children ranging from four months to five years found the crew attentive and flexible. Another group had a child who was not a strong swimmer, and the crew helped the parents take turns snorkeling while keeping an eye on the child aboard.

You should still supervise your own children. The boat is family-friendly in the sense that crew members can assist, but this remains an open-water activity. Bring any personal flotation aid your child needs, and confirm that the supplied sizes work for everyone before leaving the harbor.

Food, drinks, and the lunch question

Beer, soda, bottled water, and rum punch are included. The crew can also suggest lunch locations, and some groups have stopped at places such as Lovango or arranged food from the Pizza Boat.

Lunch itself is not included. If you want a restaurant stop, remember that eating can take a large portion of a half-day charter. A full-day trip gives you more breathing room, but you still need to decide if you would rather spend that time ashore or snorkeling.

You can also bring snacks, subject to the operator’s current rules. The crew carries its own food, so do not assume that lunch is part of the service or expect the charter to run long because of a late departure. Arrive on time at American Yacht Harbor. A delayed start can reduce your water time, and the scheduled end remains important to the crew.

Half day or full day?

Choose the half-day option if you want a taste of private boating, one or two water stops, and a shorter commitment. It works well for families with young children, visitors with limited time, or anyone who is unsure how much time they want to spend on a boat.

A half day can still produce a memorable outing. Groups have used the shorter charter for turtle snorkeling, reef stops, sightseeing, and a swim. But you will need to keep the plan tight, especially if you want to reach St. John from Red Hook.

Choose the full day if your group wants to combine St. Thomas and St. John, include lunch, spend substantial time snorkeling, or avoid feeling rushed. Seven hours gives the captain more room to respond to weather and your changing interests.

Sea conditions can affect comfort. One group reported seasickness toward the end of its outing, while another found calm water during a windy week because the crew shifted to protected areas. If you are prone to motion sickness, sit where you feel most stable, watch the horizon, and ask your doctor about suitable precautions before the trip.

The value of a $1,595 private charter

The base price is not cheap for a small party. For a larger group, though, the private format changes the calculation. You are paying for the yacht, captain, crew, equipment, drinks, flexibility, and privacy rather than buying 12 separate seats on a standard excursion.

The value is highest when your group has different interests. Parents can prioritize gentle swimming, teenagers can request turtle snorkeling, and others can stay aboard in the shade. The captain can adjust the day instead of asking everyone to follow the same pace.

Remember the extra costs. Lunch is separate, and a 15 to 20 percent tip is customary for exceptional service. The British Virgin Islands are not available on this vessel, so do not book this trip expecting a BVI crossing. Separate products are offered for that destination.

Service quality and what to expect from the crew

The company uses several captain and first mate teams, so your exact crew is not guaranteed. Names associated with especially well-received trips include Maddie, Olivia, JW, Alex, Dave, Vic, Ro, Coleman, Celina, Kahlia, Yousif, and Daron.

The best service pattern is clear: the captain asks what you want, explains the plan, shares island facts, and changes the route when conditions call for it. First mates help with gear, drinks, floats, and water access. That level of attention is a major reason private boating can feel easier than a standard group tour.

Service is not perfect on every departure. One serious complaint described poor communication, a dispute over a late arrival, and dissatisfaction with the way the day was handled. The operator disputed those claims and said its boats carry sufficient life jackets. The useful lesson for you is simple: arrive on time, explain your priorities clearly, and ask questions about safety equipment and the route before casting off.

The overall rating is 4.9 from 606 ratings, with 97 percent recommending the experience. That is a strong record, but it should not replace a clear conversation about your group’s needs.

Booking advice for families, couples, and groups

This charter is best for families or friends who can fill much of the boat and want privacy. It is also a good match for a birthday, reunion, or special day when a shared excursion would feel too anonymous.

It suits confident swimmers and casual snorkelers alike because you can spend as much or as little time in the water as you wish. Non-swimmers can relax aboard, though the group should not expect the trip to become a land-based beach tour.

For couples or small groups, I would compare the per-person price carefully. A private yacht may still be worth it for complete control, but a shared sailing trip could offer better value if you mainly want a short snorkel and a drink.

The activity is accessible to most participants, and service animals are allowed. It is near public transportation, but the meeting point is specifically American Yacht Harbor in Red Hook, so plan your transfer with that location in mind.

Free cancellation is available up to 24 hours before the start time. Cancellations or changes inside that window are not refunded, and poor weather may lead to a different date or a full refund.

Should you book this catamaran?

Book it if you value privacy, want a captain to shape the day around your group, and can bring enough people to make the price work. The comfortable catamaran, included drinks, snorkeling equipment, floats, and strong record of turtle and reef sightings make it a serious option for a full day around St. Thomas and St. John.

Choose the full day for a relaxed island-hopping plan. Choose half day for a focused swim and snorkel. Before booking, confirm the likely route, ask about current access to Trunk Bay, and remember that BVI visits are not part of this boat. If those limits fit your plan, SY Sirena offers a flexible way to see the islands without giving up your own pace.

FAQ

Where does the catamaran depart?

The charter departs from American Yacht Harbor at 84GX+24H, Smith Bay Road, Red Hook, St. Thomas. The activity ends back at the same meeting point.

How long does the private charter last?

You can choose a half-day or full-day charter lasting approximately four to seven hours.

How many people can join?

The $1,595 price covers one private group of up to 12 people.

What is included on the boat?

The charter includes floats, bottled water, soda, snorkeling equipment, beer, signature rum punch, and use of the onboard restroom.

Is lunch included?

No. Lunch is not included, though you can purchase food at some locations during the charter.

Can the boat visit the British Virgin Islands?

No. The BVI is not available on this vessel. The charter visits St. Thomas, St. John, and surrounding cays.