In the days when we were swinging from the trees I was a monkey...

In France they call it "Acrobranche". You climb up about 4 meters on a platform attached to a tree, vanquish several handicaps while moving from tree to tree, and finish with a zipline before you safely land on the other side. Ours came with 4 levels of difficulty. And a 300 m zipline above a lake. Fun times... You won't feel your arms the next day, though.