Anyone here into geocaching?
I discovered it about a year ago, gets you out in places you never knew existed, gives you an incentive to get off the couch and exercise any time of year, and its a lot of fun
Basically its a "treasure hunt" game using a GPS loaded with a geochaching software.
Registration is free, although since its a site run mainly by volunteers, they do offer Premium Membership at $30/year which gives the member few additional perks, but its not mandatory.
more info can be found here:
Frequently Asked Questions About Geocaching
Getting Started with Geocaching