My family purchased a blank USA map with the different color state stickers. The wife and kids are excited about filling in the map. I know it is ultimately up to us but what rules are you guys using ...
Its whatever rule YOU decide. Some people place a sticker if they simply traveled through the state, some if they stayed overnight, and some only if that state was a "destination", not simply an overnight stop.
We don't have a map yet, so we haven't discussed protocol yet!