There’s plenty to do at the Jelly Belly factory, located at 1 Jelly Belly Lane in Fairfield, California. After donning a mandatory paper hat, you can take a tour, peering over a guardrail at the factory floor as machines crank out endless flats of colorful jelly beans. Afterwards, line up for your free sample of one of their dozens of flavors—you can even try the weird ones, like earwax and vomit. Peckish? Don’t miss the cafe, where you can enjoy a bean-shaped pizza or burger. But whatever you do at the factory, you’ll be watched over by the presence of...