We just waslked around, did some shopping, went to the southern most point. There is some good shopping in Key West and it was fun just to look around.
We shopped and took a taxi to Chankanaab park. An employee gave us a tour which was very informational. We watched the seal show - had been before so daughter #2 was excited to see Bingo again. We did some snorkeling and swimming here as well. They have added a pool so if you don't like the ocean there's that option as well. This is a great place to spend the day.