On a somewhat related note - I highly recommend visiting the Mayan ruins at the Coba archaelogical site. It has the tallest Mayan pyramid on the Yucatan peninsula, with half of it (the inaccessible rear) still inundated by dense jungle. A few tips: if you don't want to opt for a guided tour, prepare to turn down several pointed offers at the entrance. Also, there are small rickshaws for transportation - they will inflate the distances involved to get you to hire one - if you can take a few hours total of walking including breaks you don't need their services. Quite a place! Less squeaky clean than Chichen Itza.
