What a great adventure tour! It was much better than described even. Hidden Worlds is the original primitive version of an adventure park... providing activities that would be beyond the abilities of some people, and uninsurable in the U.S. Loved the swimming and snorkeling into unlit caverns with just a flashlight! Loved the super fast roller coaster style zipline with the tarp and chicken wire "waterslide" into the cave. Loved the enthusiastic tour guides who lived for your screams and smiles, and literally ran from one platform to the next to be there for your landing. Would have liked to spend more time exploring the ruins at Tulum, but also enjoyed the one hour history lesson from our personal tour guide (it was just the two of us while everyone else there was in big groups), a former history professor who shared Mayan facts while moving from one shade tree to the next. Rene, our driver was very patient and careful and dedicated to improving his English. Not a tour for people who don't take chances or worry a lot. Perfect for people who seek the road less traveled and run laughing down it.