Okay, well I went to Hershey on Labor Day weekend last year so i remember what to do. Get there early as possible and go straight to Fahrenheit (GOOD LUCK). We headed there about 15 minutes after the park opened and it already had an hour wait.
After that do Storm Runner (Excellent ride, better then Fahrenheit in my opinion) and then Great Bear. When we went Great bear had about a maximum wait of 20 - 30 minutes and we went twice in under an hour. The ride is great and FUN...always two good things that come out of a B&M.
Next do all the woodies in the park...and Sidewinder can be done whenever along with the Wild Mouse and SuperDooperLooper.
All the other rides are just ones that can be done anytime...EXCEPT FOR THE BOARDWALK. We got there at 11:30ish and it was packed! We waited over an hour for the Roller Soaker and more then a 1/2 hour for the tornado bowl thing.
So just get there early as possible...oh yeah get one of those pay one price and refill for free all day cups, they are great. They also have good lemonade there and Nathan's hot dogs at the BoardWalk. We sat by the Tidal Force ride by the pizza place and had an amazing view of Fahrenheit. I occasionally ate as I sat and watched the ride...just amazing...
So good luck and have fun...it's an AWESOME PARK!