Cave Tubing at the park was apparently started by Major Tom as he is called, in 1992, and he and his guides do the cave tubing along with vast information about the rainforest, the Maya who occupied the area, and religious significance of the caves, exploration of a fabulous "crystal chamber" and detailed information about the entire inner caves during the float. He also arranges the zipline as a combination tour. I am sure you will not be disappointed. He also has a hilarious "suggestion list" for cave tubing. Once you e-mail an enquiry from the company, you get the list. I just about died laughing - and he ends his post on that special note!!! Fun guy, Tom.