Geocaching looks like a lot of fun. It's basically a game, played by leaving packages in discreet locations in backwoods areas and publishing GPS coordinates of their locations (some people even make puzzles to find out the GPS coordinates using letters and numbers from signs geocachers might see along the way to the find).
Since my wife has a GPS device (she's an environmental scientist, and she likes geeky gifts like that), this looks like something we might try in the future. If we do, you can be sure to read about it here.
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