This was the 2nd Cenote that we swam in, but this time we snorkeled, and it was more like a cave with the icicle-like stalagmites and stalagtites, and it was dark, not open to the sky like the last one.  This one was so different, it was my favorite one, but they were both amazing.  The other one had the waterfall, this one had more character and unique surroundings, plus it was dark!!  Spooky and beautiful!