Was in Key West this summer.  Nice place, but wow, the stink of stale beer was all over Duval St.  I haven't smelled that much stale beer since college.  That being said, had a blast, if you get the chance, do the snorkeling out at the barrier reef, if you don't dive, and the trip out to Dry Tortugas was worth the money.  If you like old civil war era forts, and more snorkeling.