The Florida Keys are home to the only living barrier reef in the United States – meaning the reefs are found in the deeper waters further from the shore. They are abundant with marine life including hogfish, butterfly fish, blue tang, snapper, swordfish, and barracuda – not to mention some gnarly species of coral. Since the reefs are so far off the coast, you’re going to have to make a day of it on one of Key West’s copious snorkeling excursions. While many opt to join the masses on a catamaran for a booze and snorkeling trip, we recommend catching a ride on smaller vessels that offer a more personalized experience. Divers also flock to the area to explore the Vandenberg and other modern shipwrecks and Spanish galleons, some of which the famous treasure hunter, Mel Fisher, made his fortune on. Adventure Watersports and Dive Key West are just two of the many outfits that offer dive trips. Here is our list of 10Best scuba diving and snorkeling companies to help you plan your underwater venture.