Geocaching, do you do it?

In the day and age of technology people are using their GPS enabled devices to participate in modern day treasure hunts. I am told this is a ton of fun, and is done year round (fall being the most fun because the leave make it a bit more challenging). Gonna have to try this myself one weekend with the kids in tow. I am sure they will have a blast. The only cost is time and fuel (and airtime for your device is your plan does not have unlimited). The concept is that you are given a starting point using GPS directions, you then look for the cache at that location which has a log book to sign, and some trinkets in it. You have the option to take something from the box as long as you have something of equal (or higher) value to deposit back in it. You then look for the next point is etc etc. They have these cashes all over the world. You can click here to be taken to the website, find out more info, and to locate a few near you.