There's absolutely no substitute for giving your kids as much information as possible.

I have encouraged my children from the get-go to sleep on the airplane or in a car, whatever mode of transportation we're using. I remind them that they will be happy that they have slept because they will have lots of energy to explore.

I have always encouraged my kids to pack their own toys and games, ... I think that's really important, that they have some control over what they bring.