I have both taught kids, and been a pediatric nurse, so I have seen kids of all ages, whether healthy or not. I do know for a fact that there are kids who cannot control their impulses, which makes taking them anywhere a challenge. That being said, most kids can comprehend whether an action is something mommy and daddy like, or do not. Basically, I believe that parents need to discuss what is appropriate, and what is not with their children long before the vacation, activity, etc and the consequences of inappropriate actions. They need to reiterate these rules with their children, and if the children misbehave, then to follow through consistently with the consequences. Kids can get overstimulated in places such as WDW, and being excited should be expected... within limits. At no time should a child's behavior cause a safety issue, such as running in the halls, getting up from chairs and running around the tables in restaurants, running away from the parents, etc. A child's behavior should also not make others uncomfortable, such as screaming at the top of their lungs in the hallways of the hotel, or restaurant. Being consistent with the rules and consequences will help a child to learn to self regulate their behavior, so the parent doesn't always have to feel like the mean parent, and let's face it... isn't it nice when other's come up and say how well behaved your children are instead of scowling and making snide remarks?