The western third is beautiful mountains; great for skiing and camping. If you’re at all interested in the history of the West, Montana has some great museums.

The Lady of the Rockies is a beautifully spiritual experience.

The eastern third is for those who like unconventional beauty. It’s commonly known as the “Badlands.” I grew up just a few blocks away from Makoshika State Park and would ride my bike out there at least once a month while growing up. The area is not flat so much as less mountainous. It is more canyons and gullies than mountains and valleys. :)