I actually went to the town of Hershey, on my first trip to the US in 1988. Place really smells of chocolate. I went on a simulated factory tour. It was a disneyesque mock up of the chocolate making process. You went round in chocolate coloured cart. Good fun actually although the chocolate is fairly dire.
I usually get through a few packs of milk duds when I'm over there. Jelly Belly beans are good. My daughters loved the bubblicious gum when they were kids and apple and cinnamon rice krispies