I’ve been here several times and I still don’t think I’ve seen quite everything. If you don’t have a lot of money to spend, but still want to go, go on Sundays. Admission is by donation (whatever you see fit to give).
I haven’t been to Hershey since 1999, although I live less than 2 hours away. I really should go back.
I’ve been to the Mutter Museum 3 times, and I’m still fascinated each time! There’s so much to learn about here. It’s great, if you have a taste for the slightly morbid.