Waymarking is the virtual version of Geocaching. Most can be done with a map instead of a GPS if need be but using one does help. I like trying to fill in the grids for types posted and found. There are some categories that are kind of boring (to me anyway) so I just find one or two of them and really go after those that I like. www.waymarking.com

I've submitted a benchmark to them. That's about all that I've done.

I enjoy it because most of them are easy to do even when you are dressed up or not feeling well and the research part can be interesting too.