Combine a snorkeling adventure with a bit of island exploring on this small-group day trip from St Thomas. Set out aboard a catamaran to St John's Waterlemon Cay, where you'll have an opportunity to snorkel among colorful corals and schools of tropical fish. After two more snorkeling sessions—including one with sea turtles—dock at the island's Cruz Bay for some village free time. Wander along its waterfront, grab lunch (own expense) and peruse shops before cruising back to St Thomas. One more snorkeling stop may be in the cards, time depending.