We went here when we visited and it was an amazing experience. It's a natural waterpark with all you can drink and eat buffets.
The entrance is centered locally in town. You can do a guided tour, take a taxi, or take the bus.
There are so many beautiful cenotes (natural swimming holes) located around Tulum. If you choose to go, please do your research on transportation to and from.
We highly recommend Taak Bi Ha!(pictured above)