Everyone and everything in Key West seems to go at its own idle pace, right down to the ice melting slowly in your margarita glass. Of course, it’s not all salt-rimmed drinks—the diving here is phenomenal, as is the wildlife and the food. Have we mentioned the key-lime pie? All of these charms have lured plenty of visitors and even convinced some to stay, including literary great Ernest Hemingway and President Harry S. Truman, whose houses remain local landmarks.