Having done Hawaii to Vancouver several times, I can say it's one of our favorite itineraries. We do prefer the westbound itinerary as you gain a few hours on the way to Hawaii. We love the mix of sea days and several days in port. After being married on Maui several years ago, we like to return to the island for a few days pre or post-cruise. We've always had smooth seas, but as others have said, sometimes have experienced cool weather as the ship nears Vancouver. That said, we just cruised Hawaii to Vancouver on the Eclipse last year and were able to use our verandah every day as it was protected from the strong and cold breezes that you might experience on one of the upper decks. Don't hesitate - you'll have a great time.