We enjoyed Key West. We liked watching the sun go down. There is a good museum that I can't remember the name of. It has artifacts from one of old recovered ships. Also enjoyed the Hemingway house:
[ERNEST HEMINGWAY HOME & MUSEUM - Key West, Florida...] and also enjoyed Sloppy Joe's.
SLOPPY JOE'S BAR - KEY WEST, FLORIDA
I can't say I would go there for the beaches. I thought they were small. We did go snorkeling though on one of the Keys and it was wonderful.