1. Check everyone's passports once every six months. You never know when you're going to be on the road and you don't want to discover one week before your ski trip in the Alps that your five year old's passport has expired!
3. Bring your own airplane food for the kiddies. The Bambina won't touch airline food and I can't say I blame her. Aside from having a stale, refrigeration-like taste, it's rarely food that I like and it's full of preservatives.
3. Bring entertainment for the luggage wait. That Nintendo DS that you've been complaining about since last Christmas when your spouse insisted that your kid have one? Well, thank your lucky stars it exists just for times like this!
The same goes for museums or art exhibits - unless you have a child who is particularly into cultural visits, he or she may quickly get bored and start to complain, thereby ruining the visit for everyone else . Try to find another family with one or more children the same age for these kinds of visits.
6. If you have an infant or toddler, bring a mei-tai baby carrier (Ergo, Kozy and Babyhawk are a few brands) on the trip with you, along with the stroller. It's very handy during when boarding the plane, during a luggage wait and for walking in quaint towns with cobblestone roads that make pushing a stroller difficult.
I don't recommend carriers such as Baby Bjorn, as the baby's weight is on your shoulders rather than your hips, and they therefore only work for small babies (that and the fact that the baby is essentially being supported on its genitals...).
7. Pack a sweater for you and each child. Always. Even if it's a beach vacation in the Bahamas!