Geocaching is an outdoor hobby where boxes called geocaches are hidden in the nature or built places. The boxes contain a logbook and pencil, and possibly a small item to swap. The cache locations are listed on the web as coordinates, and other geocachers search the caches with GPS.
The link above enables you to get to know Liminka’s geocaches.
– Finnish geocaching pages: www.geocache.fi, www.geokätköt.fi
– Worldwide geocaching pages: www.geocaching.com