Right by Hersheypark theme park is Hershey's Chocolate World, a (free) visitors' center. Kids can meet Hershey Product Characters, make Hershey treats at FactoryWorks, and buy an amazing amount of chocolate stuff. Not free, but highly entertaining, are the 4-D show (by the makers of Disney World's It's a Bug's Life), and a trolley ride tour of Hershey PA, with a singing tour conductor.
*photo courtesy of Hershey Entertainment & Resorts Company
