First of all, you will have a wonderful time!!
Do be aware that the children's sail and sign cards can be used in the arcade to purchase tokens (up to $5 per day per card) so make sure you have an "understanding" with your children if they will be allowed to do this.
Also remind the children (and/or adults) that the minibar is not free. Even bottled water in the cabin costs extra.
Also know that it is perfectly ok to bring on soda and water in your carry ons. We usually bring 2 12 packs of soda for a one week cruise.
We carry it on so that it does not get busted and get on the clothing.
Welcome to the addictive world of cruising!!