Easton, Pennyslvania, 10 mi/16 km northeast of Bethlehem, is the home of the Crayola Factory Museum, located at the Binney & Smith factory where the famous crayons are made. Though kids will get the biggest kick out of the museum, older folks may also enjoy coloring the walls and reliving the smell of kindergarten. The museum is popular, so consider making reservations in advance. http://www.crayola.com/factory.
Easton also claims the Museum of Pez Dispensers.