Excellent advice there Kate!

I've got a few to add to your list:

• If they are prone to running into crowds, have your young children wear a bracelet which has your mobile phone number on it. This is the quickest way to find your children back, especially if they are too young to remember the number themselves. (Airport staff will find this very useful.)
  
• Getting your children started on a few holiday-related projects before you leave is a great way to prepare them for what's to come. You could explore maps, or the history, geography, animal and plant life of your destination, or read books or watch a film that's set there. If the food is likely to be radically different, research dishes that they might enjoy, and try rustling up something similar before you go.
  
• In each new place, don't forget to designate a meeting point in case anyone gets separated from the group. If it's likely you'll be in really dense crowds, promising a reward for staying together works as a good incentive.
  
• Accessories for entertainment such as tape decks or portable CD/DVD players fitted for use in cars (via the cigarette lighter) help to ensure the right mix of entertainment for children. And if you don't want their fun to bother the driver, bring headphones as well.