The maximum weight limit for the Zip lines is 150 kilos or 330 pounds. (See Size limits below.) What is the maximum size limit to do the Zip lines? The maximum waist size is 120 cm / 47 inches and the maximum thigh measurement is 66 cm / 27 inches. How old does a child need to be to be able to go on the zip lines? Children as young as 3 can go on the zip line when tethered to one of our guides. How old does a child need to be to go alone and not be tethered to a guide? Children must be 8 to go alone and un-accompanied by a guide. Do I need extra cash? You only need extra cash for extra refreshments and souvenirs. What kind of souvenirs are there? You will be able to buy caps and t-shirts; by the way some are really cool. How many guides are there? The number of guides depends on the size of the group. Generally there are 8 guides in the zip line area and 3 guides in the cenotes. Is there food? Yes, a light lunch is served which consists of grilled chicken, rice and beans. How high are