You can build a tree house in your back yard as an office or extra room, or guest house or if you really love your kids a play house for them. But I am not so sure you want to waste this kind of awesomeness on kids.
Backyard zip line Bluebird Treehouse The Zip Line Ride take-off is from the deck. The long cable is anchor high above to the tree and the other end of the cable is secured to a tree. Just grab the disk seat and jump off for a fast, fun and thrilling ride.