You made it too easy to check the pricing for this
I looked at a 12 night (yes 12) from Honolulu to Vancouver 5 May 2019 - chose similar oceanview cabin, (deck 3) it's on Radiance of the Seas, refundable deposit (Royal also has a non refundable option that is cheaper but was trying to go as closely apples to apples as I could) $2400 less than the 10 night Hawaii we booked on the Wonder, deck 2 oceanview.
Now.. we can't go next May and 12 days is actually a bit long with our DS being out of school - but will definitely look into this further in 2020. The 12 night Radiance has Maui...
Edited to add:
Oh no Ovation of the Seas does a 10 night Hawaii Sep 2019... we loved Anthem of the Seas (sister ship) it's perfect for cooler sea days too... will definitely be checking that one out.
Oh why did you post this
haha