From the Olympic peninsula take the ferry from Port Townsend to Whidbey Island.
Stop and check out Deception Pass as you cross over it on the bridge.
To get to Chuckanut Drive turn left/north off Hwy 20 onto Farm to Market Road through Bow/Edison then onto Hwy 11.
Have a burger at the Longhorn in Bow.
Possible sidetrip up Hwy 11/ Chuckanut Drive https://www.myscenicdrives.com/drive...huckanut-drive
Start on Hwy 20/North Cascades Hwy and ride east over the pass to Winthrop. Cool little town
From Winthrop head east on hwy 20 to #153 to Hwy 97 then north along the River to Tonasket.
Check out Shannon's Cafe in Tonasket. Look for the deck with the big tree in it on your left .
Hwy 20 east throgh Sherman Pass then south on Hwy 25 at Kettle Falls. Outstanding road ! views
Stop in Grand Coulee or camp at Banks Lake.http://www.wsdot.wa.gov/NR/rdonlyres...04EA/0/Q11.pdf
There is a great campground Two Rivers right at the confluence of the Spokane and Columbia Rivers on Hwy 25 .Just before Fort Spokane in the upper right section.
If heading to Coulee take the side road to 7 Bays and Creston. Climb the ridge above the Columbia River. very cool
Hwy 155 south out of Grand Coulee is a great ride
Then Hwy 17 south through Soap Lake to ?
Where do you want to go? Cross back over the mountains via Chinook pass to Rainier and St Helens?