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

The best part of this St. Thomas outing is control. You get the 50-foot SY Sirena for your own group, then work with the captain to shape the day around snorkeling, quiet coves, beach time, or lunch ashore. The bow has beanbag chairs and trampolines, while the aft deck gives you room to sit, eat, and keep an eye on the water.

I like two things right away: the crew adjusts the plan to your group, and the price includes useful extras such as snorkel gear, floats, bottled water, soda, beer, and rum punch. Families have also found the crew helpful with young children and less confident swimmers. The main caution is that the long list of beaches is a menu, not a promise. Some spots, including Trunk Bay, may be restricted to commercial charters.

Key points to know before you book

• Private boat for up to 12 people: You are not sharing the catamaran with another booking, which makes the price easier to justify for a full family or friend group.
• Half-day or full-day format: The outing lasts about four to seven hours, depending on the charter you select.
• Captain-led route planning: You can request places and activities, but the captain will also steer you toward calmer water and suitable snorkeling conditions.
• Snorkeling gear and floats included: You do not need to bring this equipment, though you should bring swimwear, sunscreen, and any preferred personal gear.
• St. Thomas and St. John are available: The route can include nearby cays, but the British Virgin Islands are not available on this boat.
• Lunch costs extra: You can buy lunch at some stops, but that time comes out of your charter.

A private catamaran day built around your group

This is not a fixed sightseeing cruise with a set order of stops. You meet at American Yacht Harbor in Red Hook, board the SY Sirena, and discuss what matters most to your group before the boat gets moving.

That flexibility is valuable in the Virgin Islands. Wind, waves, swimming ability, weather, and the mood of your group all affect the best plan for the day. A captain may recommend a protected cove instead of a famous beach, or suggest staying longer at a snorkeling site rather than rushing to another stop.

The catamaran has a salon that opens onto a broad back deck with seating and dining space. At the front, beanbag chairs and trampolines offer a pleasant place to stretch out while underway. The bow is also a good spot for watching the sea, though you should follow the crew’s instructions about where to sit when the boat is moving.

The boat carries a restroom, which matters on a four to seven-hour trip. Bottled water is supplied through Virgin H2O, and the onboard drinks include soda, beer, and the company’s signature rum punch. Lunch is not included, so plan to buy food at a stop or bring snacks if the operator permits it.

How to choose between four hours and seven

A half-day charter works well if your group mainly wants one snorkeling stop, a swim, and time on the boat. It also suits families with small children who may lose interest after several hours in the sun.

A full-day charter gives you more room to travel between St. Thomas, St. John, and nearby cays. You can fit in more than one snorkeling area, spend time on a beach, stop for lunch, and still enjoy the boat itself. The key is not to overfill the schedule.

The suggested timing is at least 1.5 hours at each stop. That is sensible for a beach or snorkeling visit, but it also shows why you cannot realistically visit every place listed in a single day. The 13 locations are possible choices, not a checklist.

For a group of 10 to 12, the value is strongest. At $1,595 per group, the base cost works out to about $133 per person with 12 people, before gratuity. For four people, it is about $399 per person, so the private format becomes a premium choice rather than a bargain. A customary tip of 15 to 20 percent for the captain and crew is not included.

The St. Thomas options: coves, beaches, and easy snorkeling

Secret Harbour is a useful choice when your group wants a protected place to swim and snorkel without making the entire day about a major beach stop. It can fit well into a shorter charter, especially if you want water time close to the Red Hook area.

Magens Bay Beach is one of the better-known beach choices on St. Thomas. Its name alone can make it tempting, but a private boat does not mean you should assume every listed location will be available on every departure. Ask the captain about current access and conditions before setting your heart on one particular beach.

Sapphire Beach and Coki Point Beach give you more popular St. Thomas beach choices. They may appeal to a group that wants a recognizable shoreline and a simple swim stop. The tradeoff is that well-known beaches may feel less private than a smaller cove.

Lindqvist Beach offers another St. Thomas option for a group that wants beach time rather than a long snorkeling session. If your group includes children or people who do not want to spend the whole day in the water, a beach stop can break up the schedule.

The important point is to let the captain advise you. One family reported that windy conditions were handled by moving to calmer areas on the other sides of the islands. That kind of adjustment is more useful than sticking rigidly to a famous name.

St. John brings the best mix of water and scenery

Crossing toward St. John opens up a strong set of choices. The island is especially useful for a full-day charter because you can combine coves, beaches, and snorkeling without treating every stop as a separate mission.

Honeymoon Beach and Francis Bay are good candidates for an easy swim and a slower stretch of the day. They can work for groups that want time to float, sit on the boat, and enjoy the setting without constant activity.

Trunk Bay Beach is a famous name, but it requires a warning. Commercial charter access has changed, and the captain may not be able to stop there. Treat it as a possible suggestion only, then confirm the plan on the morning of your trip.

Maho Bay Beach is associated with sea turtle sightings in the supplied experiences. Several outings produced sightings of turtles, stingrays, octopus, and tropical fish, though wildlife is never guaranteed. If turtles are your group’s top goal, tell the captain early so the route can favor suitable snorkeling areas.

Waterlemon Cay is another St. John choice for groups focused on snorkeling and clear water. The trip can be rewarding for confident swimmers, but conditions and access vary. Ask the crew about the day’s water before deciding how much time to spend there.

Scott Bay Beach and Hansen Bay Beach offer quieter-sounding alternatives to the better-known St. John beaches. These may be useful when your group wants to get away from the busiest stops, though the captain will make the final call based on weather, time, and operating restrictions.

What the crew adds to the day

The crew is a major part of this experience. Captains and first mates named in the feedback include Maddy, Olivia, JW, Ro, Alex, Coleman, Dave, Vic, Kahlia, Celina, Glen, Yousif, and others. You may not receive a particular team, but the consistent strength is personal help rather than a hands-off boat rental.

Good crew support matters most once you get in the water. First mates help fit snorkeling equipment, organize floats, keep drinks available, and help people move between the boat and the sea. One family with a young child who did not swim well appreciated having the crew watch him briefly while the parents snorkeled.

That does not mean you can treat the crew as childcare. An adult should remain responsible for children, especially on the bow, near the swim ladder, and in open water. Still, the reports suggest that families receive patient assistance, which can make a private boat day much easier.

The captains also add local context. Guests have described island facts, route suggestions, and help finding snorkeling areas with turtles, stingrays, octopus, and fish. You should tell the crew whether your priority is wildlife, beaches, sightseeing, relaxation, or lunch. A clear request gives them something useful to work with.

There is one serious counterpoint. One highly negative experience described poor communication, unsuitable life-jacket concerns, and frustration over a late departure and lunch timing. The company disputed those claims and said the boat carries enough life jackets. The practical lesson is simple: arrive on time, ask safety questions before departure, and speak up early if the planned route is not matching your expectations.

Drinks, food, and the real cost of the day

The included drinks make the outing feel more complete. You get bottled water, soda, beer, and rum punch, plus ice. That means you do not have to organize a cooler for basic refreshments.

Lunch is separate. Possible food stops mentioned in the experiences include Lovango and the Pizza Boat, but your captain will advise what fits the day’s route. A meal stop can be fun, yet it uses part of your charter time. If snorkeling matters more than dining, say so before the boat leaves.

The price makes the most sense for a celebration, reunion, birthday, or full group of friends. One group used the outing for a 50th birthday, while others included up to 11 or 12 people. For a small party, a shared excursion will likely cost less, but it will not give you the same control over the route or the same private space.

Who will enjoy this charter most

I would choose this experience for a group that values privacy and wants several kinds of activities in one day. It suits families, multigenerational groups, couples traveling with friends, and strong swimmers who want to reach more than one area.

It is also a good fit for people who dislike fixed schedules. You can ask for a slower day, more snorkeling, more beach time, or a lunch stop. The captain can help balance those requests against conditions on the water.

You should think twice if your group wants a guaranteed stop at one famous beach, especially Trunk Bay. You should also reconsider if your group is very small and price per person matters more than privacy.

Bring reef-safe sunscreen, swimwear, a hat, sunglasses, and a dry bag for phones. The boat provides the main water equipment, but personal medication, snacks, and any preferred mask should come with you. If someone is prone to seasickness, tell the crew early and choose a seat that feels steady.

Booking is flexible up to 24 hours before departure, when you can receive a full refund. Cancellations inside 24 hours are not refunded, and poor weather may lead to a new date or full refund. Pickup from Cruz Bay on St. John may be possible with advance notice after booking, but the normal departure point is American Yacht Harbor in Red Hook.

Should you book the SY Sirena?

Book it if you have enough people to share the cost and want a private, flexible day on the water. The best reasons are the spacious catamaran, helpful crew, included drinks and gear, and the chance to shape the route around your group.

Choose the half-day version for a focused snorkeling and swimming outing. Pay for the full day if you want St. John, more than one water stop, a meal ashore, and time to relax on the boat.

Go in with realistic expectations. The captain controls the final route, weather can change the plan, lunch costs extra, the BVI is not available, and the famous beach names are not guarantees. With those limits understood, this is a strong private charter for a group that wants St. Thomas and St. John on its own terms.

FAQ

Where does the catamaran depart?

The normal departure point is American Yacht Harbor, 84GX+24H Smith Bay Road, Red Hook, St. Thomas.

Where does the activity end?

The charter returns to the meeting point at American Yacht Harbor.

How long does the experience last?

You can select a half-day or full-day charter. The stated duration is approximately four to seven hours.

How many people can join the private charter?

The price covers one group of up to 12 people.

Is snorkeling equipment included?

Yes. Snorkeling equipment and floats are included.

Are drinks included?

Yes. Bottled water, soda, beer, ice, and signature rum punch are included.

Is lunch included?

No. Lunch costs extra, though food can be purchased at some locations.

Can the charter visit the British Virgin Islands?

No. The BVI is not available on this vessel. A separate product is required for a BVI trip.

What happens if the weather is poor?

If the operator cancels because of poor weather, you can receive a full refund or choose a different date.