A Cenote is a natural sinkhole that exposes the groundwater underneath. They are all over the Yucatan Peninsula – both large famous ones and small local ones. Two of them are easiest to access by bike from Tulum. If you have a car you have access to lots of them.
The water within the Cenote is fresh water and is normally very clear. You can swim in it as well as snorkel and, in some cases even dive. Some of the cenotes go quite deep. Inside this one you can see bats and turtles.
Inside this centote turtles swam past me and little fish are swimming in there that eat the dead skin from your feet. It tickles a bit. I did not see any sharks 🙂
You need to take a shower before you get in and the water is quite cold, but it is hot outside so it is a good balance. Also you are not supposed to wear sunscreen since it can pollute the water. Whether it does so or not I do not know and like most rules in Mexico it does not seem to be enforced very much.
They installed a rope with bouys to help you inside the cave. This cenote is quite large with 2 caves on two different sides and separate sinkholes where the light comes though. It’s about a 20 minute bike ride from Tulum town.