I read an article in Wired about a new thing called GEOcaching.
If you are (like me) one of the geeks who have bought a GPS, but when it get down to reality, you never use it for anything, then you should try geocaching.
Around the world (134 countries) is hidden around 25000 caches. A cache is a small box with a few items (keyrings, CD's, etc) and a log-book. Sometimes the also carry a camera, so you can take a photo of yourself when you discover the cache.
On the geocaching site you can registrate and view a list of the caches closest to you.
I have only discovered 3 caches, 2 around where I live and one on my vacation in Rhodes. I also tried to find one near the Danish city Odense, because I was in a business meeting there already. This was not a good experience - I ended up in the middle of a very wet corn field all dressed up in the Armani suit and then I discovered that I have entered the wrong coordinates in my GPS for the cache - bummer!
Well, I would recomend it to anybody - the kids love it and so do I.