I was on a 3 year cruise back in the early sixties (Navy) and went to Hawaii.
This cruise will be a little different; you don't even have to make your bed!
I just got back a few days ago from a week in Maui. Going to Hawaii by ship is the best of both worlds! The first days at sea will be very relaxing, and will give you lots of energy for your arrival in Paradise. It's a lifestyle you could get used to, as I'm sure your brother has told you.
Congratulations on your retirement!