We're embarking on the Westerdam on the 18th and not getting off, however, you still need ArriveCAN to get on whether or not you plan to get off. ALSO, on HAL's website as they've updated vaccination and testing protocols under what they call Enhanced Protocols. It appears for Alaska/Canada cruises, people 18/older must have a booster if their initial final Covid dose was over 5 months ago. I'm currently waiting for a HAL agent to come on chat to confirm this - hope I'm wrong in interpreting the updated protocols. I've attached the Enhanced Protocols here.
enhanced-health-protocol-090922-2.pdf