I went to Hershey the October of '08. I found it to be a very quaint and pleasant park. It almost reminded me of a larger Holiday World with steel coasters.
I found the park layout to be very hilly and almost displacing, but I found my way around eventually.
From my memory, the quality of food was pretty average (although I found it tastier than most Kings Island food, for the record.) I believe that food prices were relatively low compared to other parks (Busch Gardens Tampa, for example.)
I didn't get a chance to see any shows besides passing by a kid's show on my way to Fahrenheit.
Service, at least for me, was very pleasant. I'm not sure of any special offers they have, though I'm sure if you look around you'll find some.
I had a very enjoyable time while at Hershey, and I'm sure it's a trip you won't regret! There is much more to do in that area than just the theme park as well (including the chocolate factory and gift store. Gettysburg is also about a half-hour away if you're interested in american history.)
I hope this helped!