I’m addicted to geocaching! It’s like searching for hidden treasure in every cache.
If you never heard of it you should check out geocaching.com or watch this snazzy introductory video.
Basically geocaching is a worldwide scavenger hunt using GPS coordinates to locate the cache. Its fun, safe (relatively), cheap, and gets you out and about to places you might not have been to or walked right by without a second glance. Sometimes there are trinkets or things inside, sometimes only a log book to say you were there.
Victory pictures below after finding my first and second caches. Oh the feeling of accomplishment!