I went to 4 years ago and the cenote was a beautiful natural phenomenon the mayan's used it for human sacrifice so that's why you can't go swimming in it they don't want people disturbing the final resting place of their ancestors yes it is messed up but they didn't know any better their beliefs required human sacrifice at regular intervals and they thought that the sun would not continue to rise unless a sacrifice was made regularly

It was magical! The water is clear, it’s just dark because you are deep in the cenote and no sunlight gets down into it. It’s clear when the sunlight hits it at a certain time directly on the water. There’s little black fish in the water but the size of goldfish. They don’t bother you they are just swim nearby. It’s pretty incredible! Pictures don’t do it justice! Be sure to bring a waterproof phone case!

Due to the limestone basis of the Yucatan Peninsula, there are no rivers, which means the ancient Mayans had to rely on aquifers. The most important water source were sinkholes called cenotes. This one was so important it was sacred and viewed as a gateway to the underworld. It is a must see but the trail is lined with trinket sellers, which means you have to run the gauntlet to get here.