In Germany, ropes courses gained a strong increase in popularity over the recent years. They are pretty fun and you can "magically fly" through the forest. You get this harness and can lock yourself into 300 feet long ropes in 30 feet heights and just fly from tree to tree. I'm sure, you can find them also in the US. If you get the opportunity, check one out.
One of these was built recently in my backyard. Looks like great fun and they do good business. (Though I'm not going to pay $100 to tour the woods I hike daily for free)
http://en.wikipedia.org/wiki/Ropes_course