Come swim with the resident green sea turtles and tropical fish on this 3 hour , 15 minute snorkel & sail adventure in St. Thomas aboard The VI Cat. From your departure, set sail on our 54-foot US Coast Guard inspected catamaran to the idyllic Caribbean waters of Turtle Cove at Buck Island National Wildlife Refuge. Seeing the green sea turtles in their natural habitat truly is a life-long memory. Note this is Little Buck Island located off of St. Thomas.