Skip SLC.

You can easily cut down to Devils tower from HWY 212 cutting across SE Montana. Then on into Sundance and over to Spearfish. If you are in to motorcycles, Sturgis is worth checking out as is Bear Butte. I would skip Wall Drug and cut south into the Badlands from Wall.

Grew up in Mitchell, not a fan of the Corn Palace, but you could certainly do a drive by. The corn murals are interesting and have no idea what the inside is like anymore as I have not been inside for over 25 years. The Indian village is very interesting if you like that kind of stuff.

Really enjoyed Island Park, Beartooth Hwy and Lamar valley. Jackson Hole and Tetons the same. The museum in Cody is at least a full day in itself.

Fairmont Hot Springs is a big thumbs up. Have stayed there a few times and really enjoy it. Going to the Sun road is incredible.

Arcus Venator