If the noon departure time works for you, the Washington ferry should work fine. The land border crossing at the same time (mid afternoon) is bound to be slow, especially approaching a weekend.
I posted links to photos of the terminals from a ferries forum on the other thread (the one on traveling north to Port Hardy). WSDOT (washington's transportation website) also has web cams at the ferry terminals.
Took the Sydney-Anacortes ferry for the first time last year. Beautiful cruise, no turbulence as could be the case on other ferry routes. Took the Tsaweassan-Duke Point ferry to Vancouver Island, cost $283.40. Return trip from Sydney to Anacortes was $169.30. Coach and toad are about 60 feet long. Entry to the port in Sydney requires you to go around a couple of blocks in order to make a straight-on approach to the entry point; otherwise, a very, very sharp turn that many big rigs cannot make.
Discovery 39S Tin Teepee
Honda CR-V Toad
Jeep Cherokee Toad
Enrolled member of the Comanche Tribe
Bichon Frise bear killers:
Lord Shonefeld von Reginald-Friese IV.
Lady Annabelle von Lichenstein-Friese III.