More than 200 islands comprise the Florida Keys where, just offshore, a necklace of dive sites parallels the archipelago.
There is easy access to shallow reefs and spectacular wrecks, such as the Adolphus Busch Sr. or the U.S. Coast Guard cutters Duane and Bibb, and visitors can swim with dolphins, celebrate the sunset or even stay in an underwater lodge. 61 of the region's best sites are described here.