Having Rosalee firing on 4 cylinders was an added boost for the trip, I had purchased the Spy Kids DVD containing movies 1,2 & 3 and had more snacks than a vending machine which eben then made it tolerable excursion for all.
It does not matter how much stuff you bring or what activities are on offer such as face painting by 2pm you are over the boat and endlessly count down until you dock at 7pm another 5 hours away.
For my two cents leave the car at home, fly and hire. It just makes more sense. Or take a few travelcalms you won’t miss much.