Climb a Tree

http://www.treeclimbing.com/

I got it in my head just a bit ago that it would be cool to climb some trees sometime in the near future, so I searched for it (mostly out of boredom) and found that there's an international foundation for it. This is their website. It's a bit more high-tech than I was going for, but I thought it was interesting that there was a whole group devoted to climbing trees. I think I'll have to check it out some more.