The region from the southernmost point of the Florida peninsula, stretching south and west to the Dry Tortugas National Park, is one of the most biologically diverse ecosystems in the continental United States, and there's no better way to explore it than by kayak. Here the freshwater temperate latitudes meld with a tropical marine environment to create unique paddling opportunities. In the nearshore waters, secret mangrove tunnels, unending beds of turtle grass, and colorful sponge flats contrast with the vibrant coral-studded waters found offshore. Bill Keogh is your guide to this paddler's...