I would link together the north Interurban Trail, Permanent #627 Queen Anne Loop, and Permanent 1015 Queen Anne-Everett.
Go north on the Interurban to 76th Ave W in Edmonds, then follow #627 backwards into Edmonds. Continue north on 9th Ave S instead of turning on Main St. Pick up #1015 at Caspers St. #1015 will take you right to the Mukilteo ferry.
You could also follow #627 from Seattle instead of taking the Interurban. Another option is to follow #627 backward from the Burke in Lake Forest Park. Both are hillier than the Interurban.
HTH,
Bill