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Privately operate preserve with hiking trails, and a zipline. The park's main feature is its fascinating rock formations. M$50
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It's good to be the king, and Texcoco's famed wise king, Nezahualcoyotl, established a sprawling retreat for himself that included America's first botanical gardens, and all the trappings of luxury befitting a powerful Aztec king, including stone tubs for his hot mineral water baths (there are actually several baths, including one called the "Concubine's bath". Yeah, like any of us think the king hung out in a different hot tub than the ladies...)
Molino de Flores National Park
Colonial hacienda with abandoned church, grain mill, fields and gardens. 49 hectares in area with picnic areas and horseback riding available. The ruins are amazingly photogenic --- like scenes from a movie set in sterotypical revolution era Mexico.