GPS-Gadget-owning nerds have had a new game for a few years now: geocaching. Here’s how the game works: you lookup the locations of geocaches on various geocaching websites, find the geocache, take something from the cache, add something else and make a note in the frequently enclosed logbook. Typically, the caches have little value. Doesn’t sound that exciting, does it? But as one hunter put it: it’s not about the treasure, it’s about the hunt.
The most popular Geocaching site (according to Google, anyway) is, you guessed it, geocaching.com. They’ve got lots of info on the activity, including a FAQ.