I can tell you what we did on a very brief visit to North Dakota. We came up from the South--South Dakota; arrived at Medora and drove through Theodore Roosevelt National Park (South Unit). This seemed to be a good way to see that national park. Spent the night in Medora at a commercial campground, not the best by any means, but ok for overnight. Drove on next day to Bismark area, spent two nights at Fort Lincoln State Park at Mandan. Drove around to the Lewis and Clark sites and the Knife River Village. Enjoyed the state park and the historical sites. From Mandan, out of North Dakota through Fargo into Minnesota.
I know this was a very brief visit, but it was part of a much longer trip and it fulfilled our desire to include North Dakota on our travel map.
I'm sure others will be able to report on a much more adequate visit to one of the last visited states on many RVers map. For us it was just right.