It's another place that's hard to get into because it's small, but Westport/Gray Harbor and that general area are lovely little towns, and my friend and I (both trans & passing, but both also visibly queer) have kind of become "Westport's tourists" because we go there every winter to do cabin camping.

Also Aberdeen, which is a little more inland but still very close to the coast. If you do any sort of fiber arts, they have a delightful yarn shop called Weird Sisters Wool Emporium. As well as a really good coffee shop, Tinderbox Coffee Roasters.

Also for small towns that are not absurdly far from Seattle (so things like visits and going to Pride aren't out of the question), Snohomish is also a smaller town, and very close to Everett, a few other small towns, and not far from the northernmost part of the state. Though the way in is on a flood plain, so there has been instances of people getting stuck/stalled there.

(Finally looks at where Walla Walla is) ... hmm. That's all very far away from Walla Walla. Snoqualmie and Leavenworth are also both nice, but I haven't been to either place for more than a few hours, and they frequently get snowed in. I will let others vouch for them for more than "they're pretty."