CA to WA questions

I know you prefer State parks, I have always found them hard to plan for, so I will offer a few private sites we visited this summer with the 9 year old grandtwins. Benbow Valley KOA in Garberville will wonderful. Large spots, a golf course next door (I don't play) but it meant no airport/train/etc. Minutes from the Redwoods. Along the Oregon coast, Gold Beach is great. We stayed at Turtle Rock RV. Rustic but large and lovely, with plenty of places to run or hike. Gold Beach has the speed boats up the river, and plenty of fishing, you can cast from the campground. Loved the Olympic Peninsular, spent a day at the State Park just hiking (walking), beautiful, we again stayed at Port Angeles KOA, a newly refurbished KOA that was great and many improvements were in progress. We stayed at the Seattle/Tacoma KOA, crowded small but clean campground, but it is really one of the few games in town. Best part, it was only a couple of miles from the Boeing Museum and Skunk Works. This is not to be missed, more than just a flight museum, it is a well presented time capsule of avionics around the world. The kids loved it. Better than we expected. Like others say, Portland is just another dirty city. My youngest lived there for a year and returned to Los Angeles years ago. There is really not much for kids to see, just a city known for it's weirdness. Yes, they have VooDoo Donuts, but they are not really worth the hour wait in line. Not a place to drive the RV. The Columbia River Gorge, on the other had, is a great drive. Spend a couple of hours at the dam, where you can see the salmon jump up the ladders, and the hatcheries. Then there are miles of waterfalls along the way, best seen in a car, as parking is tight, but if your into walking the RV is OK, you will just have to walk back a lot. Up in that area there is a trout farm in the Troutdale area. Many acres with 9 large ponds, stocked with trout of various sizes. You get real fishing poles, and of course you pay for what you catch. However the prices were less than market price for trout, and they were beautiful delicious fish. Unlike some trout farms, these guys were not starving and going for an empty hook, the kids actually had to work a bit to catch 2 each. It is also a lovely park area, bring a picnic lunch, plenty of parking and an easy turnaround. Hope this helps, enjoy