Isla del Coco, one of the largest uninhabited islands in the world, provides an unspoiled environment for divers. One of the main attractions is the variety of sharks that populate the surrounding waters in large numbers—Cocos is particularly famous for its schools of hammerhead sharks. The island was once a refuge for pirates—and supposedly still conceals buried treasure. Visits to this remote place are strictly regulated; except for yachters arriving under their own sails, trips must be booked through companies that specialize in exotic dive destinations and are part of extended tours (a week or more). 300 mi/485 km off the Pacific coast of Costa Rica.
