Cayo Scoop! The Ecology of Cayo Culture

Barton Creek Cave, and Barton Creek Outpost get good reviews in this article.  

"Just some metres away there is a cave (Barton Creek Cave), which you can visit by kayak and check out 8km of passages.  It is known both: as a touristic destination but also as a archaeological site.  In cave there were found remains of at least 28 humans and many pottery shards, which makes scientist believe there was a life already at the beginning of 1st century.  The strong evidence exist already in the first kilometre of kayaking, where on the left ledge one can see human bones and skulls.  In the dark as hell cave, between stalactites and flying bats, it makes a strong impression."