I took one of those rainforest tours where I was forced to hang out with a group of tree-hugger strangers for four hours. They spent the whole time in a metaphysical nirvana state as they communed with nature while taking breaks to lament about the ozone layer, global warming, George Bush, and the usual laundry list.
Despite the droll company, I still had a good time. There were about eight zip lines that went as high as 200 feet from the ground. About halfway through, there was this tree house that was about 150 feet off the ground. It was cool to stay in for about five minutes, but then I was ready to find a Starbucks (as were, ironically, the environmentalists with me.)
(Pictures went on to get married, rent apartments, and pursue careers as political lobbyists.)