7. Stay Late
As the night wears on, the crowds tend to thin out. After all, small children (and even adults) who have spent the entire day in the park are pretty exhausted by 8pm. By taking that afternoon break, you can take advantage of the thinner nighttime crowds with plenty of energy to last until closing.
If you have a choice, be sure to fully enjoy this advantage by catching the later nighttime shows. They are almost always less crowded, but are not always an option, so be sure to check first.