The Simpsons Season 20 Episode 19 Waverly Hills, 9021-D'Oh

Homer suggests to Marge that they go on a vacation, and Marge agrees. He then tells the kids that he is taking them to Waverly Hills to an amusement park. However, after arriving at the alleged amusement park, it is revealed that it had been shut down years before and what remained was destroyed by an earthquake. The family ends up stranded in the town, which is shown as being run-down and deserted. Meanwhile, at home, Grampa tells Lisa that he has several ailments and wishes to die. Lisa promotes various remedies that leave Grampa fitter and healthier than ever before. Back in Waverly Hills, the family bickers over what to do, but eventually find themselves mistakenly locked inside a Salvation Army store. There they uncover a variety of enjoyable activities, such as singing and performing theater. Eventually, they manage to escape and continue on their vacation.