Didn't get to see much in the Caymans. You are only there for about 4 hours! However, we did go on a Reef and Wreck snorkel tour and that was very good!
No cruises added
Cozumel was a good port of call. They let you off at a very large shopping complex, where you can either buy very cheap souveniers or book shore excursions if you haven't already done so. We did the Fiesta party boat and were mildly disappointed with it. We expected for the boat to just sail and tour the island for four hours. Instead, the boat sailed directly to a beach adventure park (free admission) that offered a variety of beach activities. Fun for children, but the party boat advertised exactly what it sounds like...a PARTY! Free drinks, cool music, etc....we only received about an hour of that.