Washington state Seattle area suggestions wanted

My Rainier is great for hiking. Tourist go to Paridise and visitor center. Make reservation for Cougar Rock CG. If you want less crowds go to White River CG and go to Sunrise Visitir center. White River CG is first come first serve. Really great hike to Fremont Lookout. Olympic NP great camping at Kalakla(sp?) right overlook of the ocean. Also toward Port Angles is Hurracane Ridge. Also don’t miss Mt St. Hellen’s.

I think I would adjust travel time to avoid Seattle rush hour instead of the cost of ferry travel.

Avoid Seattle!
Depending on which way you are coming. I would suggest if coming I-90, turn south at Ellensburg. Take WA 821 down the Yakima River canyon byway. There is several BLM campgrounds. Contiue south on I-82 to US 12. Take US-12 west to Mt Ranier.
After visiting MT Ranier, especially sunrise, continue west on US 12 to US 101. US 101 takes a big loop around the Olympic Pennisula. Several good government type campgrounds all around pennisula.
When you get to east side take the Port Townsend Ferry to Whidbey Island. Follow WA 20 east through the North Cascades National Park.
Good time to see Grand Coulee on your return trip.

Avoid Seattle altogether. Unless you have to go there dont. Its become a sespool nearly as bad as San Francisco. There was an article just today in the news about SEA police quitting in droves. On top of that traffic is absolutely horrible. But Mt Ranier, Mt St Helens, Grande Coulee dam are worth visits. Grande Coulee has lasar light shows during the summer. From Grande Coulee you should head SW toward the Oregon coast. But again be aware parks on the coast will be booked solid, so probably not a good place to visit. In fact, camping in the far west is super busy this time of year.

If the weather's good, you could park your rig at Anacortes and take a ferry around the San Juan Islands for a day trip. I don't think you'd regret it.

Lake Pleasant RV Park is a very nice campground in Bothell, a suburb of Seattle, but good luck trying to get in without a reservation in high season. We also liked Thousand Trails near Anacortes. It is a short ferry ride from there to Port Townsend on the Olympic peninsula.