We are sailing on the Magic next week. We are still trying to decide between three excursions for Cozumel: Tulum Mayan Ruins, Dune Buggy, Jeep Adventure. We have been to Cozumel twice before and have already explored San Miguel and been to San Gervasio. Anybody have any experience with these excursions or any suggestions for making the decisions. What is good and bad about each of the three excursions. Thanks.