Which route are you going to take? How long are you planning the trip for?
Your question is pretty vague and could include like half of the courses in the country. My answer will vary depending if I'm recommending the top 3-5 courses, or if you're planning a month long expedition of course bagging.
If you happen to come through Wisconsin before MN, I'll happily show you around Bald Eagle, I'll probably have 16 playable holes or so by the time you were to get here.