We are planning to visit a cenote during our upcoming trip to Mérida. I've read the info in Yucatán Today and numerous other websites (being a compulsive web researcher). The Cuzamá cenote tour looks interesting, but I wondered about a couple of things. Do the cenotes generally have a slope to them or are they a dropoff into deep water? Are they safe (I know that's a relative term) for non-expert but reasonably competent swimmers? Are there other underground cenotes (besides Cuzamá) within an hour or so of Mérida.?
If you have time to post, I love to hear the personal experiences and impressions of the forum participants & welcome all suggestions.