Geocaching is an inexpensive sport that can be enjoyed by people of all ages. It can be played by individuals, families, or groups of friends or co-workers.
The purpose of the sport is to locate "caches" anywhere in the world with a GPS or other navigational device. Caches usually consist of a logbook of visitors and trinkets to trade. It's fun for everyone to play, even if it amounts to being a search for Tupperware hidden in the wild!