Geocaching is like treasure hunting, but with a really good map. Caches are hidden boxes or objects, and the GPS coordinates are logged in an official database. With a GPS unit, like a smart phone, you can go searching for them! When you find it you can sign the log book found with the box, and if you have trinkets to swap you can take a little treasure home with you. We left a few coins, and the girls picked out a clam shell. This cache is at a trail/park just about a block away.