Steve's next state was going to be Oregon, the Pacific Coast state that borders California on the North. It's also a BIG state, and, like California, has an overwhelming variety of scenery. Steve's original route was going to take him up through the south central part, and perhaps he'll stick with it. Eastern Oregon is very dramatic desert, in starkest contrast with the forested Western part of the state on the other side of the N-S Cascade mountain range:

I admit to giving Steve some not-so-hot advice about where to ride, based on assumptions about some parts I hadn't actually driven over. Hopefully I won't have led him astray, or maybe he'll forgive me if I did.
Idaho is next, where I grew up and which I've driven over extensively in the past 20 years. Note the contrast between the desert-mountain southern part, the broad and flat-looking Snake River plain which came from a MASSIVE lava flow from Yellowstone NP, and the endless forested mountains north of there. It's got liberal Sun Valley, right-wingers holed up in the northern panhandle, and everything in between. BTW, it's some 400 miles plus from top to bottom:

Montana is next. Again, there is a forested Western part and a dry Eastern part, which is high plains rather than desert:

They tacked on Yellowstone NP in that tab hanging down toward the bottom left. Steve had plotted his trip along the Interstate that bends down to the Wyoming border somewhat to the right of the bottom center. It goes right by the Little Big Horn Battlefield NM, where Custer ended his days.
Next was Wyoming. Unfortunately, the Hubbard website didn't have the larger WY image up, so this will have to do:

The curved mountain range in the top center (like a closing parenthesis) is the Big Horn range, and Steve's route travels to the right (East) of that. You can see the Interstate bend East about half-way down the Big Horns, to head off to Devil's Tower (WY) and the Black Hills (SD). Lots of Sioux Indian fighting history in those parts.
This should do, since the rest of his states are not as dramatic. I hope this gives you at least a tiny idea of his travelin' territory.
Larry