Stick to your regular routines as much as possible. Try to limit the number of changes in naptime, bedtime, and meals during the holidays.
Children act out when their lives become unpredictable.
Don't change the rules or the way you enforce the rules. It is very common for us to become more strict or more lenient during the holidays. Don't over-do it. The most common mistake we make is trying to do too much. You just can't do everything when you have young children.