Seek and you shall find
Yesterday I read about something called letterboxing. No, not as in how movies are letterboxed on television, this is a kind of global puzzle game. The idea is that there are these boxes hidden all over the world, you just have to figure out the clues to find them. Once you find one you stamp the log book in it with your rubber stamp, and then stamp your own log book with the stamp from the letterbox. Sometimes you'll find things like clues on where to find another letterbox. One reason this appealed to me is that it is similar to Geocaching, something I've read about a few times and have always wanted to try out.