Just came back from an Alaska cruise about a week ago on NCL. Really did not see much COVID.
Very few people were masked on the cruise. Elevators were packed, port shuttles were packed, we did an excursion that was close quarters.
Neither of us picked up covid (unless it was entirely without symptoms) despite pretty much forgetting it existed.
Some places in Alaska might ask you to put on a mask when indoors but we did not run into any of them in our walking around.