One of the things I like about Key West is its ability to appeal to diverse interests.  Most think of it as a place for sun and water sports.  But it offers some interesting historical elements.  The Audubon House on Whitehead Street was home to a wealthy "wrecker" in the 19th-century.  It is believed that Audubon conceived several of his works in the garden of this house.  Tours of the house and gardens are offered and provide a glimpse into an important era in Key West history.  The gardens are pleasantly cool and offer a nice respite on a hot day.  The gift shop sells interesting objects and the fine art gallery offers works by Audubon and other artists.  http://www.audubonhouse.com/

Key West's location made it an important naval station for the U.S.  On the grounds that were once part of the Navy Base is Truman's Litttle White House, the place he went to escape from Washington.  Many other U.S. Presidents and international dignitaries have used the site over time.  Tours are offered and artifacts from the Truman presidency are on display.  http://www.trumanlittlewhitehouse.com

Key West continues to support a thriving artistic community.  Many famous people from all branches of the arts have made Key West home.  One of the most famous is Ernest Hemingway, who lived on Whitehead Street with his second wife Pauline for over 10 years.  You can peek through the gate or over the wall as you walk by, but it is worth taking the tour of the house and grounds.  Each tour guide has his or her own spin to the information, so it is fun to walk through a couple of times.  The bookstore has copies of Hemingway's writings, as well as books about him and other souvenirs.  Many of the famous six-toed cats roaming the property are likely descendants of a cat Hemingway owned.   http://www.hemingwayhome.com/