Or you can use a mapping site to plot your route (use the "directions" feature). I love zooming in using satellite view, and you can also use streetview to see things from street level (it's just like walking down the street) - www.maps.google.com
Thank you all :)
You could consider driving on to Prince Rupert, the ferry then gets you directly onto the North of Van Island .
Buccaneer Dave's links will help- it's called the 'Inside Passage' route, as he says booking is essential with a car on this route in August.