I cannot help in regards to Washington, as we haven't been there (yet).
I will say that back in 2007, after we visited Glacier NP, we had reservations at Ponderosa State Park near McCall, Idaho, and they had to be canceled due to large forest fires in the area. We ended up at a real nice CG called Canyon Pines, near Riggins, Idaho. Very nice spot, right on the river and close to the Seven Devils of Idaho, Hells Canyon NRA, etc. Very scenic area and peaceful. Our 3 boys had a blast floating in truck inner tubes down the river at Canyon Pines. I think we stayed there 3 nights, then went on to a brief stay across the state to the west entrance of Yellowstone. Did a quick drive by tour of Craters of the Moon, which was awesome.
I'm sure you'll have fun. Seemed like Idaho is spectacular and I can't wait to get back there someday. For Washington, my first choice would be the Columbia River Gorge.
