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I would actually avoid the City Tour. We were there just last week and had the City Tour as part of a package to see the Mayan ruins. The city tour consisted of things such as "...and there's the hardware story...and over there is the bank. There are some school children playing off to the right..." Our driver actually stopped at his house because he needed to get some extra cash. It was actually quite funny, but not something I would do again. Most people we talked with seemed to enjoy the cave tubing the most.