Those with GPS, lets go treasure hunting!!!
I found the most awesome thign today..... A sport called Geo-Cashing! People make this little "treasure chest" like cache hidden away very good somewhere. Them they get the gps coordinates and post them to this site http://www.geocaching.com/
So, you use your gps reciever to fidn the cache, take osmethign from it and replace it with soemthing of your own... then you right in the log book that is there... Is that not awesome or what! its a global treasure hunt!