LB_NJ,
My knowledge of transfers from Seattle Airport to Vancouver comes from a cruise we did ages ago on HAL. Indeed the journey between the two locations is not too far but a cruise line transfer will be cheaper and less hassle than a one way car hire journey. There are also bus option between Seattle and Vancouver. Given the size of the Queen Elizabeth, the journey up to Alaska should indeed include the Inside Passage transit at least on the Northbound leg. This typically involves routing via the Seymour Narrows between Vancouver Island and the mainland. The large mega ships are too large for some of the narrow points in the journey hence they need to take an "outside" passage route.