Alright so this is how this works. (Thanks to ysabel, amjhdrummer, and Katgirl1991 for the idea!)
You make a cardboard poster of some sort that says something along the lines of:
"GF WAS HERE!" and your username if you want.
Then you find a cool location and take a picture of yourself holding the sign. It can be anywhere you want. Doesn't have to be near where you live. Just a cool place for GF to make a presence in.
ysabel promised an Eiffel Tower "GF Was Here" picture if other people will do it in their cities so lets get on this.
Whoever gets the best location wins rep I suppose.
I have an idea for a place but I won't say it unless I can pull it off.