are you going to be travelling to reach where you start the bike rides? or riding it randoneuse style?
So, the way i see the Cascade (and Olympic) mountains around starting with seattle on a bike, there's six quadrants so to speak:
1)the olympics (strictly subdivided into about six zones there); 2) the north cascades corridor, 3)the mountain loop corridor, 4)the snoqualmie pass corridor, 5)and the chinook/rainier corridor. White pass could be include the dark divide between rainier and adams and saint helens as the sixth quadrant.
Once you cross the mountains into eastern washington there's a whole nother range of possibilities there.
So, you've got those choices to explore. there's the watersheds blocking off a fair bit of access between stevens pass and south of the snoq, limiting upcountry roads in those regions.
The mountain loop provides a lot of nice wandering. good views too heading to nason ridge in the stevens pass corridor.
Jack Pass (the road sounds exciting right now!) up the old cascade road to stevens pass, then down to nason ridge and over to lake wenatchee and up from chumstick to avednior and onto Lake Chelan is about the most stout backcountry cross riding i can think of.
In the olympics from seattle a nice ride is from sequim to the dungeness forks CG, then up and over bon jon pass to drop into quilcene past mount townsend. stellar.
you can get very far in a day from seattle on a bicycle. but then, you're out in the middle of the woods!
so, some bivy gear is in order. so then its camping and 'backcountry bicycle touring'
