Angelita is beautiful, but it's more of a sinkhole than a cavern. It is a deep dive. Of the more traditional "cavern like" cenotes, one of my favourites is Kukulkan which is part of the Chac Mool system. This photo is of "the wall of light" and it does not do justice to how beautiful this place is! The halocline is present in the Chac Mool system, so you'd get a look at that also. If you do decide you have a destination in mind, do mention that to your guide or dive shop when booking, as if you fail to tell them that, they may have another destination in mind for you.
have fun!
have fun!