Try doing some searches here.
http://www...ard/forumdisplay.php?f=6
Lots of talk right now about salmon in the rivers. 8 wt is a must. Look for references to the Cedar/Skagit/Green. Might want to take a look at a map showing local rivers then search on those. The Skagit is about 1 hour north of Seattle. If you would rather lake fish I hear Pass Lake is doing well right now. That should take 5 wt but requires a water craft of some sort.
Two warnings. Car break-ins are extremely bad up there, poachers are abundant and read the regs very carefully as they can be pretty confusing. Remember that in Washington you cannot lift a fish out of the water unless you plan on keeping it.
Oh and have a great time. It is a beautiful area.