The Florida Keys The Florida Keys are a string of tropical islands stretching about 120 miles off the southern tip of the U.S. state of Florida, between the Atlantic Ocean and Gulf of Mexico.  They're known as a destination for fishing, boating, snorkeling and scuba diving.  The southernmost city of Key West is famous for Duval Street's many bars, Mallory Square's nightly Sunset Celebration and the Ernest Hemingway Home and Museum.        Source - Wikipedia