Pedalin' with a Purpose Postcard Idea

So after much brainstorming and sketching based on the Ork posters I posted a little while ago this is the post card concept I came up with for the PwaP boys. The idea is so that while they're on their trip they can circle, check, x or mark in whatever way they'd like the location they are currently at to send out. They can also hand these out as promotional material where people can mark and sketch on it in the same way.

We might do a couple of rounds of this but this is the initial concept with a hand sketched and lettered United States as the main portion of the post card.