From Kamiah ID to Puyallup WA by way of Lewiston, Spokane, Grand Coulee, North NP, Denton WA.

Washington drivers are dawdlers.
The Clearwater River valley/Canyon is beautiful, with linked turns from Kamiah to Joseph. It's like a long slalom course with shade and a river nearby.
I dig the Spiral Highway from Lewiston to the top of Lewiston Hill. Overlooks the Snake River with Idaho to the left and Washington to the right.
Pretty much all the apples in the world are hanging on trees on the Okanogon Valley. But I wouldn't give a fig for the country from Spokane to that first apple tree. And, lordy, Grand Coulee is desolate.
North Cascades NP cannot be adequately described. Sorry, Im not that good with words.
The only good thing about following Washington drivers is the fuel consumption. I got 48 mpg on two tanks.