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.
