We were up there a month hosting a State Park on the OP. The grandkids went crazy when we told them we were going to Forks, but I suspect that has run its course. Cape Flattery is a long drive but pretty amazing views and one of those "I've been there" moments. My wife wanted to take a whale watching tour and I wasn't so thrilled, but it turned out pretty interesting. Lots of water and whales here and there, but to watch one of those beasts break the surface is a rush. If you drive the loop, it's a beating and eleventy billion trees. But, if you have never been to the Pacific NW, it is interesting in the culture, architecture, etc. The rain forest is a must see.
If you have time, the Naval Ship Yard at Bremmerton is interesting. If you have any naval history interest, just driving by and seeing that line of ships and some of the names you recognize immediately. I really wanted to see the museum there but it was being renovated when we were there. My Dad was stationed there in WW II so I had a nostalgic attachment to the facility and the museum. There is also a submarine base there but not sure what you can see as we never drove over there.