Key West is a good port. We vacationed there just a few weeks earlier. We did all the tours then, so we didn't do any excursions. We just went to early mass and walked around for awhile. We loved the basilica in Key West and liked the priest. That was a very good experience. My husband and his friend went back out for a visit to a historic bar, Captain Tony's.
On our earlier vacation in Key West, we enjoyed visiting Hemmingway's home and the Little White House. I would highly recommend that. The trolly is also very good. You can get on and off when you want. That's more fun when you have more time.