What do you like to do?
You can visit Crater Lake, the coast, Portland has lots of things to do, you can go skiing. Washington has Seattle, and there is a ton to do there. In Montana? I would say the only thing of interest (IMHO) is Glacier National Park. DH goes there on motorcycle rides every couple of years. And loves it, but he likes to get out of populated areas.
We got to go there on Saturday. We shared appetizers. Fried mac & cheese, buffalo blasters, and roadside sliders, the bread ofcourse and got cakes. It was the best. I hope you get to go! (or got to go)