I would recommend having early dinning time. My experience with kids on celebrity being difficult is those with late dinner times who were hungry and tired. Bring lots of activities to keep your kids busy. Bring OTC kids meds you could possibly need.
bring travel sized games, colouring books, books, anything that will keep your kids busy. I still remember some of these from when I was a kid traveling or when my grandmother packed my little bag for church with a toy and snack.