I don't often fish Washington, so I can't comment on that except to check the closures they announced earlier this year. In Oregon I'd start on the Deschutes, then head south to the North Umpqua and/or Rogue. After that head to the coast and head up hwy 101 to Cannon Beach, maybe stoppng at the occasional coastal river that has summer run fish, searun cutts, or early salmon returns. Then I'd head up to the Olympic Peninsula before heading to Seattle. On the way back maybe hit the Clearwater or Grand Ronde.
"Perhaps fishing is, for me, only an excuse to be near rivers." - Roderick Haig-Brown