When are you going? If it's a flat day like this Wednesday, Go to Cattle Pass, plot a straight course for Admiralty Inlet and leave early!
Otherwise, you may want to do the "Inside Passage" behind Whidbey Island. Thatcher Pass to Guemes Channel to Swinomish Channel and on through LaConner. LaConner and Langley are nice stops on that route with lots of shops and restaurants.
Be safe, have fun!