On the way to the Tetons

[PNW Judy]

I could use some help. Before meeting some friends in the Tetons this summer, I'm planning on going to Glacier, then to South Dakota, then back through Cody to the meet-up.

My current plan is to go from Billings to Belle Fourche via 212. On the way, I'll be stopping at Little Big Horn. I'm not seeing much else on this route all the rest of the way. For almost 300 miles. Yes, I know there are no boring roads but, at the same time, it seems there must be something to look for on that route. Any ideas?

Or any ideas for a better route to get me into South Dakota?

I'm planning on seeing Devils Tower on the way back. But should I should see it on the way there instead?

I'm sure I'll have more questions later as my planning progresses. Thanks in advance!