Trailing off the mainland like a fluttering kite tail, the celebrated Florida Keys are unmistakably American and blissfully tropical -- an American version of the easygoing, laid-back Caribbean. Land and water interweave for 155 miles to create a one-of-a-kind vacation of romance, history, adventure and good old-fashioned fun. Without a doubt, the Keys have the best diving, snorkeling, fishing and boating in the continental U.S.