Cenotes Miguel Colorado has two large scenic cenotes (limestone sinkholes). The price of admission includes kayak rental and a couple of very high ziplines that go over one of cenotes. You can hike along hilly, rocky trails to each cenote, keeping an eye out for spider and howler monkeys. Swimming is currently not allowed but might be in the future; there may also be rappelling opportunities.
It's possible to visit a bat cave in the area and a lake called Laguna de Mokú (home to crocodiles), but you'll need a guide (M$30 extra for each).
To get to the cenotes, drive 60km south of Champotón on Hwy 261, then take a 10km potholed side road to the village of Miguel Colorado. Turn left at the village and go 3km more.