Next door to Garden of Eden and Azul Cenotes is Cristalino.  Cristalino is much smaller and quieter and cleaner.  This is one of our favorite places.  It also has the cliff jump that the kids love!  You can chill out and sit along the side with your feet in the water, and get a free pedicure courtesy of the little fishies who eat your dead skin (you will pay $15 for sitting with your feet in a tank of these fish on 5th Ave Playa del Carmen)  But the best thing about Cristalino is the Secret Cave!  Ask me when you check in for directions to the secret cave!