seattle to portland is best done on the west side of puget sound down to Shelton, Olympia, thru capitol forest and past mima mounds natural area, then to napavine to pick up military road and westside highway to castlerock and down to the bridge across the columbia at Longview.
riding the coast will take an extra week, easy, if you tool around Port Angeles way first.
make a loop, sure, just avoid pugetopolis conditions by utilizing the ferries to ride the west side of puget sound and all the way to seattle proper without having to ride in 100 miles of suburbia. the only other good alternative to the east of I-5 is: there isn't one.
Last edited by Bekologist; 12-11-09 at 01:11 PM.