My husband and I are planning to fly from Michigan to Spokane, Washington. From here we hope to go to Glacier National Park and stay there a few days. Then we will go back to Spokane to drop off a friend and then go on to Yellowstone National Park. After we have seen this, we are thinking of driving over to the Coast of Oregon and driving up the Coast to Seattle. Has anyone done this trip? What highways do you suggest and how long will this take us? We are thinking of taking two weeks. Then we will fly back to Michigan. Any suggestions?