A friend of mine introduced me to Geocaching over ten years ago. He had recently gotten a GPS for backpacking and discovered Geocaching. He showed me some printouts and how he used his GPS to navigate to caches. We didn't actually hunt for any. I filed it away and did nothing.
I now have kids (8 and 6 years old) and a new iPad3 with GPS. We had our first away from home camping trip this past weekend and I was looking for stuff for the kids and their cousins to do in the state park we were staying at. I remembered this activity and it seemed like a great thing to try. Boy was I right on that count! It's amazing to see five kids swarming over an area when I announced that we were within ten feet of the cache. They are amazing little hunters. When we got home my six year old spent an hour finding a good plastic box and orgainzing a bunch of trinkets to bring along the next time we go on a hunt.