Yal-ku is a privately owned cenote that is connected to the open sea via a lagoon and estuary. It offers a beginner level snorkeling experience with depths ranging from three feet to over twenty feet. Fish and an occasional turtle or ray can be seen, but go early!
Every year this lagoon gets more attention - and more crowds. Remember to bring only certified "biologico" sunscreen as each container will be scrutinized by the owners and rejected if it contains non-ecological ingredients (anything other than zinc oxide). In by 9, out by 11 and you'll enjoy your day.
There's a cafe, shaded areas to keep the sun off, and beautiful bronze statuary throughout the park. It's a gem, but don't expect much in the way of varieties or numbers of fish or corals.