I am not too familliar with the Seattle area roads.. but I would be inclined to take a ferry and explore the San Juan Islands some.. you can take it from Seattle to B.C. The islands are nice to visit..
Vancouver B.C from Seattle...easy just get over to Hyway #9 and cross into Canada at Sumas, Beautiful road. Then you may want to try the Chuckanut drive (just south of Bellingham) but on the west side of I-5. You have so many beautiful roads in Washington and I've been on many of them. Eastern portion of the state is just motorcycle heaven. Maybe think of doing Cascade hyway (# 20) to Winthrop as well.
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