you drive north in I-5 and hang a left through Stanwood. Weather will be either decent or chilly, hard to say.
look at this stuff on gmaps.Edited: 07 September 2012, 18:04
there is no ferry to Camano. Its easily driven and Amtrak has a station in Stanwood if you want to take the train from downtown Seattle. There is also an airport shuttle that serves Camano.
If you are looking to do it without a car, there may be buses but it wouldn't be direct. The Airporter can get you to Mt. Vernon. I'm not sure about Mt. Vernon to Stanwood, or Stanwood to Camano. Getting around on Camano without a car? I don't know if they have a bus system or not.
The free bus service from Camano to Everett, which was heavily used by folks commuting to work in Everett and students going to and from Everett Community College, was discontinued by the legislators who came into office as a result of the last election. Traffic congestion leaving the island on weekday mornings has increased commute times significantly because of the sharp increase in cars on the road as a result.
Please note this posting was from 2012