I once lived in North Dakota for three years (Minot), then the three after that in Montana (Great Falls). I’d traveled quite a bit between Great Falls and Minot/Bismarck during those handful of years too. Get yer Google Maps up for this one. . .
If possible, avoid Dickinson and Williston, ND. Not that there’s nothing there, but the oil field worker population has really driven the charm out of those towns. Minot too, to a certain degree.
Do hit: Glacier NP (obviously), and Great Falls is a good destination for the Lewis & Clark Interpretive center. A lot of history around that town. There’s plenty of little towns along the Missouri River you can pull the camper into, and stay overnight by the river hassle free. From Great Falls, if you take US87/MT200 to I-94, you can see some beautiful scenery in Judith Gap, and great little towns like Belt ant Lewiston. After Lewiston, it gets a little ‘badlandy’ which I kind of enjoyed, but if you’re not into that, hang a right and go through Roundup down to Billings and pick up I-94 there.
Otherwise, once you cross into North Dakota, the Little Missouri Grasslands/Teddy Roosevelt NP are nice and I think let you camp out overnight. I also highly recommend the little town of Medora during the summer. I think they still put on a Western show in the evenings during the summer. Then you can swing through Bismarck which is okay, but an hour-or-so north on US is Fort Mandan, where L&C overwintered their first year out. There’s another museum up there, which was really expanded after I left, I hear. Further east of Bismarck is Jamestown and Valley City, which are ‘western’ towns too. Jamestown is the home of Louis L’Amour, and there’s small rodeos and bullriding events normally on the later-weeknights.
I can give you a few other local highlights if you want. I don’t know if Bottineau still hosts ‘Rockin’ in the Hills" or not–a few days of classic rock acts over several stages in farmers fields . . . seems to be hit or miss every year. Heck, you might make Norsk HǿstFest up in Minot, or even the State Fair.
What’s your itinerary? I might be able to pull up some more info for ya.
Tripler
Oh Minot. . . good times, good times.