Hwy 20 across WA state provides gorgeous vistas. Once you reach the coast you may as well take a ferry out to the San Juan Islands...Orcas is among my favorites.
The ride from Winthrop over Rainy Pass, past Lake Ross Overlook, and down 20 along the mighty Skagit, is by far the prettiest, most scenic ride there is,, and I've done most of what this Great Nation has to offer...
Turn back turns, big lean glides thru waterfalls mists, with Bald Eagles screaming at you as you ride by... my oh my...
COOL! Never been to the Northwest -- I hope to someday!