Before the Grotto tour, we visited this small Cenote and swam in it, at the beggining we were quite suspicious and the water was very cold, but was a good preparation for the dive in the big cenotes and the grotto.
We started the Grotto tour descending a stair into a hole in the ground, then we swam into the first Cenote (all the Cenotes and the underground passageways are very well iluminated with lights from different colors). The best part is looking at the thousands of Stalagmites and Stalactites, sometimes the visit is quite worriying (some passages are very narrow and full of water) but at the end there´s another big Cenote to swim.
This natural private park, is located 20 kms from Playa del Carmen, just in front of our hotel (Barcelo Mayan Resort). The name means Yellow Stone Mouth, and has some great fresh water Cenotes and trails through the jungle. We paid $38 for a visit to the Cenotes, the visit included the wonderfull Grotto Tour, all the Equipment (life jacket, snorkel, mask) and a guide is provided. A real good experience.
The park is very big, and if you don´t want to walk a lot under the strong sun, there is a horse cart rail service betwen the first Cenote and the last. Very funny...
During the visit our guide explained us how a Stalagmite and Stalactite grow, and by the width and the length of most of them, the caves are really old.