With the exception of Cozmuel, we've booked our own excursions. In Key West we are going on the Echo Catamaran for Dolphin viewing, island tour, and snorkeling. We have the vow renewal for the in-laws first thing in the morning in Grand Cayman, then we will probably do some shopping or beach time afterwards. We are going to do Xcaret Eco-Park in Cozumel.
While researching where to have the vow renewal in Grand Cayman, I stumbled upon Cemetery Beach in St George which is apparently a great beach that has great snorkeling, with half the amount of tourists that Seven Mile beach has...we may head over there too.