You could make a spokecard that is a map of the US and then as you travel places, add stars to the card to signify which cities you've hit.

Back when I thought I could get away with spending most ofmy young life travelling the world, I toyed with the idea of getting a tattoo across my shoulders that was one of the spread out maps of the globe and getting stars added for each city/ place I visited in my travels.

Then I decided I wanted to go to grad school and make alot of money instead of being a penniless bum.