DH and I did the Tulum Ruins in Cozumel when we were on a cruise in '97. It was an excellent tour and our guide was outstanding. He did a great job explaining the history and the mayan influence. At the time we didn't have children but I can see for those with school aged children how this tour would be an excellent educational experience for them. Between the history and then of course the ruins themselves, they can really learn a lot about another, ancient culture. They can learn a lot of things in school but I think hands-on is even better, especially for children!!!
Lisa