I am taking the same route, only on the Splendour in December. I have not yet been to Belize, so I can only offer my =twocents on the other 3 ports. On my upcoming cruise, Im taking my parents, my grandma and her friend all on their first cruise.
Costa Maya: The Chacchoben ruins were great (ship tour). Many complain about this port because it is not as developed as the other Caribbean ports, but it was one of my favorites. Now once I've been there a few times, it may become boring. But as time passes, it will grow, and offer more options.
Grand Cayman: Swim with the stingrays. There are several independent companies offering this experience. It sounds like they are all good. Dont take the ships tour, more expensive and much more crowded. The Atlantis Sub here was fun (booked by contacting them directly online, cheaper than the ships tour). Also did a glass bottom boat once, that was fun too. Theres lots of places to swim and soak up the sun along 7 Mile Beach too.
Cozumel: So much to do and see here. We've done the Tulum ruins (recommend only doing this via ship tour) which was great, but it was a long day. If staying on the island of Coz, consider renting a jeep and driving it yourself. Its beautiful, and this way you can do whatever you want at your own pace. Chakanaab Park is quite popular, I believe this is also where the dolphins are ($12 entrance fee to the park, dolphin swims are additional and pricey). Lots of great places to eat and swim and shop.. etc.
Do a search on the different boards here for each port to find what others have suggested in the past. Lots of info here. And by the way... =welcome aboard!
Post Edited (04-06-04 13:36)