My family and I did the zip lining tour over the river yesterday and it started out great. The guides were very knowledgable and helpful. Unfortunently half way through our tour a lightning storm hit and we were stranded across the river with no way back. The van was somewhere in town and the guides were unable to maintain radio contact with the shop since " our radios always go out in a storm". Finally one of the other employees drove their own personal vehicle over to pick up the kids and the van showed up later to get the adults.
Just check the weather before you go. I am sure in normal conditions this is a great experience.