These days, even a walk in the woods can be transformed into an “extreme” sport. Take “geocaching,” for example. Hikers looking for something a little different on their treks created a global hunting game, hiding “caches”—packs filled with goodies like CDs, photographs, and journals—in obscure places throughout the world. They then post the coordinates at www.geocaching.com, where other hikers can use them, along with a global positioning system (GPS), to join the worldwide goose chase. Geocaching works on an honor system: When a geocacher takes something, he leaves a cache of his own behind. Vacationers can get in on this trend at resorts like Utah’s Red Mountain Spa, where they can learn to use GPS and coordinates to find caches filled with spa products.
This passage was written mainly to inform its readers about __________.