The one "gotcha" in OR state parks is that many of them pre-date 102" wide rigs with slides. Often (and Harris Beach is a prime example), the site roads are narrow and the actual sites are square-on to the roads. Even with a 32' rig, I had difficulties maneuvering and scraped up a couple of stow-bin doors on a rock wall.
Otherwise, a great palce to visit. We took 3 weeks to go from Astoria to Brookings!
In addition to the Evergreen Aviation Museum, there's another one at Tillamook. Even without the airplanes (all flyable) the building is worth a visit. It's an old US Navy airship hangar. The main hall is (from memory) 325 feet across, 192 feet high to the peak of the roof and about 1700 feet long. It could house 6 blimps, fully inflated. The amazing thing is that the buiding is all wood construction, except for the sliding door systems each end.
Have fun!