Most parks DO NOT page for missing children. Long lines are the most common frustration at large parks. As you enter the park go to the left. A study has shown that most people unthinkingly go to the right. Also go to the back of the park and work your way forward.
Most people stop in the front of the park at the first major attraction that they see.
Many shows and entertainments are held in air-conditioned theatres. Use these during the afternoon. Plan a budget ahead of time and think of ways to cut costs. Other parks provide small picnic areas just outside the front gate. Think about how you can save money and stick to a budget limit.