First through the Cascade Mountains
Then miles and miles of wheat fields (Eastern Washington)
Through the top part of Idaho. Coeur d' Alene lake area.
Then down Look out pass into Montana. I like to stop in Haugan Montana where the 20,000 Silver Dollar Bar and gift shop is. It's the only thing there!
After that it's all down hill to Missoula Montana. Which I hope to get to in time to have dinner.