If you loved to do treasure hunts when you were a kid, I found a new hobby for you! Geocaching.
The idea behind geocaching is to find hidden objects (caches) that have been planted around the world, share your experiences with others online, and connect with the larger community. Once you have found a geocache, you sign the logbook and return the cache to its original location.
What you need to find the caches is a good sense of adventure and a GPS.
At this time, there are 804,108 caches around the world. To start the process, a person puts their postal or area code onto a website and then the program searches for caches in your vicinity. In our neighbourhood, there are 149 caches hidden.
If you want to see how it works, here is the getting started part of the official website.
Now, where did I put my GPS?