Yes, I discovered Geocaching last Christmas after being given a Garmin SatNav.
Great fun, although my wife is normally better than me at spotting them. We're still relative beginners, but hope to spend more time on it this summer.
On a recent holiday in the Canary Islands, I left a Travel Bug in a cache with the aim of getting it brought back to Wales. It's currently in Germany, and you can see its progress
here, (although I guess you'll need to register/log in to see that)
Apologies to anyone not familiar with Geocaching - this must sound like a load of rubbish.