Lots of good advice here from the locals. My perspective is that there are way too many things to see and experience between Michigan and here. So many miles to travel and too many things to spread yourselves thin. My advice is to pick a couple of things in each state and zero in on them.
Don’t worry about Seattle. You will waste lots of valuable time fighting traffic, getting lost, and wishing you were somewhere else like Mt. Rainier, or the Olympic Peninsula, or North Cascades National Park, or the Long Beach Peninsula on the Ocean, or Grand Coulee Dam, or the Columbia Gorge, or the Palouse Hills and Palouse Falls, or the Wenatchee River Valley, or Riverside SP in Spokane, or following Lewis and Clark’s route through SE Washington and up the Columbia to Astoria, Oregon, etc. Any two or three from that list will give you good memories of your visit to the far Pacific NW. Those are a good sample anyway.
