We took the canopy zipline tour and it was a lot of fun. Since it is the rainy season (although this year it isn't that rainy), we were the only people who booked and therefore got a private tour with 2 guides. There were 12 platforms in total and we went over full forested areas and several rivers. The waterfall is quite fun, about an 18 ft jump from the top and also a tarzan swinging rope. The water was warm and there was no pressure to hurry out. The guides were very nice and helped with every component. It felt very safe. A drink was included at the end.
There are a lot of stairs though, and can be quite tiring for someone out of shape.
Apparently, there are approximately 140 different zip lines in costa rica and this one is considered moderate in size.
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