^I agree, try to head to the back of the park first. Possibly stopping at Fahrenheit first.
I was at Hershey Park a few weeks ago and the only lines that were really long were Fahrenheit at about and hour and the Roller Soaker that was about 2 hours. The board walk water park is a big draw for most people, especially on the hot days. The lines stay a little shorter, for the coasters and other rides, while the water attractions are open. When it closes the lines get longer. We headed straight back to the Wild Cat, Wild Mouse, and Lightning Racers first and waited only a few minutes for each. I would recommend that plan for your trip.