We just took the tour last week. The ATV tour is pretty good, while it is not very hilly it takes you through some very bumpy areas with mud pupples and even a little track with a jump at the end. The animal preserve is a little "touristy" but it's pretty cool to feed the monkeys so take a couple bananas with you. They'll take you through a cave with live bats to show you the cenote's and explain how they work which is enjoyable. We took the snorkle option and saw 5-6 sea turtle's and a couple of sting rays as well.
It was a very enjoyable day that lasted about 5 hours with travel time. The tour guides are friendly and do all they can to make sure you're having a good time.
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