I'm looking for the best cycling route to connect the South end of Centennial Trail in Snohomish, with the bicycle trail system around Bothell and Woodinville. The final destination is downtown Seattle, so connecting to the Burke-Gillman Trail is my objective.
We're not adverse to sections where we have to share the lane when needed, but the trip will be on a loaded touring bike, so the most important thing to avoid is long hill climbs with no shoulder on busy roads. We'll be moving slow when climbing.
I have RWGPS and know how to use the heat maps and other tools, but what I don't have is first-hand bicycling experience with those roads, and local knowledge of shortcuts that a bicycle can use. Any specific help would be appreciated.