This was the most scary/awesome/beautiful experience that we had in the Yucatan. The caves are easy to find. Once you get there, you see a few men laying around in hammocks waiting for visitors. It is owned by a a family that has been exploring the caves for generations. We had a young guy named Daniel (in flip flops) do our tour. He gave us the choice of tourist (1/2 hour), adventura (1.5-2 hours) and extreme (5+ hours). We choose the adventura. He did not speak any english. My boyfriend didn't speak Spanish but it was easy to read his gestures and I translated for him also. We entered into the main cave and it was gorgeous. Then we put on our headlamps (we had our own but Daniel had some to use also) and started into the caves. You had to squeeze through very tight spaces, covered in bat guano. Do not expect to come out clean! It truly was an adventure. It is not for the faint of heart though. Expect to be scared and physically exhausted. There were some very sketchy rope set-ups and it was very slippery. If you fell and got hurt inside the caves (which is very possible), I do not know how you would get out. If you don't like bugs, the dark, stories of sacrifice, getting dirty, bats or tight spaces, DO NOT do this tour! I was a little frightened by the stories of the Mayan sacrifices and the mummies carved into the walls. It apparently is where many people were dragged into the caves in killed by Mayan priests. We came out with some banged up knees, filthy clothes and an appreciation for sunlight :)
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.