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I have not been to Chachhoben, but have been told that there are more excavated buildings at Kohunlich. We visited Kohunlich on a Celebrity excursion last year and really enjoyed it. We had an excellent guide. You don't have to climb all the ruins. Most of the walking is over grass. We also have enjoyed Tulum which covers a greater area and had the beautiful setting on the beach. Kohunlich is in a jungle - the trip there is thru marsh land and poor villages.