Amtrak
One thing North Dakota has over South Dakota is that the train from Chicago to Seattle (and back) passes through it and makes a bunch of stops. While riding, you can go to the cafe car and get food, go to the dining car where you choose from a menu and get served by waiters, or sit around in the lounge car, sipping a drink and reading or watching the scenery through the gigantic windows. Or just go to a coach seat and sleep; compared to a bus or a plane, the coach seats are huge, and unfold in all kinds of ways to make lying down more comfortable. The only minus is that the Amtrak doesn't pass through Bismarck.The stops, by the way, are: Fargo, Grand Forks, Devil's Lake, Rugby, Minot, Stanley and Williston. Opposite order if you're going east.
