Culebra more than makes up for its dearth of entertainment options with its wealth of diving opportunities. There are reportedly 50 dive sites surrounding the island. They’re mostly along the island’s fringe reefs and around the cays. In addition to huge diverse coral formations, divers commonly spot sea turtles, stingrays, puffer fish, angel fish, nurse sharks, and more.

Among the most popular dive sites are Carlos Rosario (Impact), which features a long, healthy coral reef teeming with sea life, including huge sea fans, and Shipwreck, the site of The Wit Power, a tugboat sunk in 1984. Here you can play out your Titanic fantasies and witness how the sea has claimed the boat for its habitat.

Many of the best dive sites are around Culebra’s many cays. Cayo Agua Rock is a single 45-foot-tall rock surrounded by sand and has been known to attract barracudas, nurse sharks, and sea turtles. Cayo Ballena provides a 120-foot wall dive with spectacular coral. Cayo Raton is said to attract an inordinate number and variety of fish. And Cayo Yerba features an underwater arch covered in yellow cup coral, best seen at night when they “bloom,” and a good chance to see stingrays.

The island’s sole diving and snorkeling source, Culebra Divers (across from the ferry terminal in Dewey, 787/742-0803, info [at] culebradivers [dot] com, www.culebradivers.com), offers daily snorkeling trips for $45. One-tank dives are $60, and two-tank dives are $85, including tanks and weights. Snorkeling and dive gear is available for rent. It’s also a good place to go for advice on snorkeling from the beach.