So at work a coworker told me about this thing called geocaching and it's supposedly been around for awhile. Basic idea is people leave something hidden for others to find. Inside is a log book where people can write their name+date they found it. Pretty interesting idea cause you don't need to just leave a log you can also leave items inside to "mark" that you were there. ie magnets, trinkets etc.
All you need is a GPS able device, most smart phones should be able to do this now, added with a data plan (to make it easier to pinpoint) and you can go out and find these caches. Figured this might be fun to play in the future once spring hits. So you post up saying which geocache you are going to find and see how many others get to it. The site can log caches you find, pretty much based on honor system. But there's really no point faking you found the cache it's all in good fun