It sounds like a great experience to float in an underground river, but actually, there is not much to see during the ride. You can brink your snorkeling equipment or get a life vest, mask, snorkel, and fins (extra cost) at the entrance to the rivers, where you can put all your belongings (towel, sandals, non-waterproof items) in a bag that is locked. They give you the key, and they will take care to bring it to the end of the rivers for you to pick it up.
There are two rivers to pick, but it doesn't matter, as the end is at the same area, and both have almost the same things to experience along the route. In case you get bored, you can exit at a couple spots along the river, but anyway, you will ...Read More