My son and I are flying to Seattle, picking up a friends car and then driving home to Arizona. Any advice on best routes, places to see or fun things to do along the way would be appreciated. So far, we are flying into Seattle, checking out the space needle and then heading to Portland to VooDoo Donuts. Next, we are driving to Mt. Shasta and then heading home. If you have driven this route before any advice would be great. Thanks.