geocaching is an outdoor treasure-hunting game in which the participants use a gps-receiver to hide and seek
waterproof containers (so-called "geocaches" or "caches") anywhere in the world.

a typical cache contains a logbook and "treasure", usually toys or trinkets of little value. all you need for
geocaching is a gps-receiver. go and visit the site, log in and check if there is a cache
hidden in your area. caches can be hidden almost anywhere ... on high mountain peaks, under water but
also right in the center of a big city.