I vote the river cruise. Driving down a good part of the keys, it's suburbia and strip malls. Nothing nice. It's nice the last 1/3-1/2. Key West is getting way overdeveloped. Went there in 1990 and 1991 , and then back in 2000. Couldn't believe the change. Duval was charming (still) in 1990/91 but by 2000 is full of chain outlets and the few odd shops selling geegaws. Too many cruise ships too (they weren't there in the early '90s). Tennessee Williams thought it was ruined in the '50s.