Learn which rides are appropriate for certain ages and sizes of kids. Children under the age of 13 are at greater risk for ride injuries than the rest of the population [source: Saferparks]. Read and follow the safety guidelines for each ride. Don't push the limits.
If you decide that a ride is appropriate for your child, stand off to the side and watch a cycle of the ride together. See how the vehicles move, how riders react and how long the ride lasts before you board. Watch your child's signals. If he or she doesn't want to experience a particular ride, move on to the next one.