Two in our group were afraid of heights, but they overcame their fears and took on the tree obstacle course! With the exception of one or two, most of the sections were not that hard (if you're not afraid of heights). And the whole thing is super safe, being clipped in at every moment, and with guides to help you. We loved it because we had never done anything like the tree course before, although we had ziplined in more extreme circumstances, so that part was fairly tame. Fun way to spend 1-2 hours, depending on how busy it is!!! Plus it's right next to Ruby Falls Cavern, in case you want to do both.