Suggest route between Boise and Chicago

[Trailryder42]

Hey all,

Got some kin to see. Once I make my way to Boise, ID, what are some of your favorite routes, west to east, to the Chicago area?

I'm going to be on my Vstrom 650 with knobbies and camp gear. Have good off-road skills.

I have a prelim route devised with things like Yellowstone, Grand Teton NP, Devils Tower, Mt. Rushmore and Capt. Kirk Birthplace to see along the way so far.

I've never been in any of that country. So any suggestions would be welcome. Here's a .gpx of what I've come up with so far.

Thanks for any suggestions.