John Pennekamp Coral Reef State Park: A perfect introduction to the Florida Keys, this nature reserve offers snorkeling, diving, camping, and kayaking. An underwater highlight is the massive Christ of the Deep statue.
Under the Sea: Whether you scuba, snorkel, or ride a glass-bottom boat, don't miss gazing at the coral reef and its colorful denizens.
Sunset at Mallory Square: Sure it's touristy, but just once while you're here you've got to witness the circuslike atmosphere of this daily event.
Duval Crawl: Shop, eat, drink, repeat. Key West's Duval Street and the nearby streets make a good day's worth of window-shopping and people-watching.
Get on the water: From angling for trophy-size fish to zipping out to the Dry Tortugas, a boat trip is in your future. It's really the whole point of the Keys.