There is a time when one will go backpacking, there is a way where one will go biking, but here is the time when one needs a car, as long North American roads require.
Heading South through North Dakota happened in a blink of the eye. The friendliest (Dakota is the native Sioux word for “friend/ally”) highways with almost no traffic gave us the chance to reach our first way point very soon: Badlands National Park. Not that the lands we’ve seen in the first 2 days of our trip were any better (chuckle!), but I can’t really say that the prairies, or rather the Great Plains, were very appealing. The Great Plains cover most of North and South Dakota, and the endless plains, hills, shrubs and grass that you can see all over can make you think if these areas are really inhabited. But yes, ranching is the predominant agricultural activity, as we could see hundreds of herds of cattle with alternating fields with rolls of hay; so we figured out people are still living in these places (I guess only the brave ones), even though we very rarely saw anyone.