Geocaching!
Woot! I had a delightful little impulse moment yesterday - went out and bought a GPS so I can take up geocaching. There are a ton of sites in the Chicago area, probably because we have non-Federal forest preserves up the ying-yang out here. Can't swing a dead cat without hitting one. So I think I'll try to find one of the easy ones closest to my home, and maybe take the guys out to it Saturday if they're interested.