Taking off of Matt W's idea.
We need a Plaque made like the logo here on the site. It would have to be small enough to fit into a fixed rate shipping box from the post office.
How it would work. Lets use Larry as an example, he likes to be picked on.
Larry has the plaque, he takes it to local areas of interest, takes a few picture of the plaque and himself or just the spot in question. He post the pictures. He then says PM for who wants it next. First PM gets it shipped to them. No one but the sender knows where it went until the next set of pictures are posted. Then the cycle just keeps repeating.