I dove in Cozumel a couple of years ago with German Yanez who is an NSS instructor. My dives were limited because I only had 1 day (I was on a cruise). In any case I would recomend him to anyone looking to cave dive. He was very safe and thorough his briefings. The cave we dove was hidden off the side of a road (the name escapes me at the moment). You had to hike about a 1/4 mile in the woods to get there so it wasn't something you could find on your own. His web site is below. Hope you have a great trip.
http://www.yucatech.net/
Jose
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