Personally, If I had the time, I would take Hwy 12 to I82 and then in Ellensburg, get on Hwy 97 for a beautiful trip north, checking out Leavenworth, Wenatchee, and finally spending at least a day at Lake Chelan, taking the ferry ride up the lake. Then I would take Hw 2 to Spokane and Coeur d Lane, stopping at Coulee City to see the dam plus some of the most spectacular geological sites along the way. Unless you have friends in Coeur d Lane, its a good overnight, but not a lot to see or do and if it were me, I'd continue on Hwy 2 to Glacier.
