There is no better way to get Eastern Wa than to go via Chinook Pass. I could not guess how many times I have driven it.
http://chinookscenicbyway.com/
WSDOT - Chinook Pass Update
I live on the Western side near Enumclaw. They are targeting the opening May 25th, the same day as Beartooth, which I have also enjoyed driving.
Stop at Whistlin Jack's for lunch or dinner.
Whistlin' Jack Lodge - Restaurant and Mountain Lodging - Chinook Pass, Washington
Heck, if the timings right, lunch on me on the Western side.