Josh and I found two yesterday, and our adventure led us to climbing trees, sliding in the mud, and seeing some new sites. We have small portable GPS systems we use, but you can also use your smartphone. You just plug in the latitude and longitude coordinates (Waypoints), and the GPS will guide you to your cache. Some cache's are micro, however some are large enough to trade trinkets. We like to find the tradition cache's where you can trade trinkets, however sometimes the caches marked "other" are a little more exciting.
If you want to find out more about geocaching, visit: https://www.geocaching.com/
You can search for local geocaches or a specific type of geocache. It's also a fun activity to do when you are camping!