Washington State is a “shall issue” state for CCW. Not sure what prevents them from issuing it other than a felony conviction - but there may be other reasons.
Open carry is allowed if you can legally own a gun.
However - there are plenty of Liberals on the west side of the state so there are other reasons not to visit! (East of the Cascades is very conservative though).
I am very familiar with WA state. I lived in Bremerton for 15 years. My wife is from Seattle. We left there in 2006 and came back to my home in Alabama. Here we shall stay and there we will never go back even to visit.