After my Mother passed away, my Father remarried a few years later.
I can state without reservation that he had exactly zero interest in going on a cruise, any cruise. Nor, frankly, did my Mother. I have only cruised on little grey boats with numbers on the side
His wife convinced him to go on an Alaskan cruise and everything changed. He loved it.
After the initial cruise, they went on a number of different cruises, Wind Jammer, the Viking River cruise, etc. What he liked about them was "unpack once" and the shore excursions.
Jims5543's post is spot on, btw.
Enjoy, Uncle B, great stuff!