Jimmy and Christine surprise Greg and Kim with a weekend trip to the Grand Canyon. Courtesy an RV. Christine makes them hand over their wallets so they won't try to pay for anything. The trip gets off to a bad start when the three see Jimmy rented a smelly, dirty, 1970's RV. When Christine asks where's the nice one they picked out, Jimmy says the rental place sprang extra fees and this was all they could afford. Forced by Kim to go, Greg gets a good night's rest expecting to see the Grand Canyon when he wakes up Saturday morning, but all he finds is Jimmy overslept. Jimmy speeds to make time, which makes Greg RVsick. At a rest stop, Greg has it out with Jimmy for giving him such a lousy vacation and driving so badly. Jimmy says he can drive then, and throws him the keys -- which fall right down a grate. Since Jimmy put the spare on the ring, they have to wait until Sunday morning for the RV place to FedEx a new set. Greg asks Christine to give him his wallet so they can go to a hotel, but she left them at home. So they're stuck seeing their sights in the rest stop Saturday. On Sunday, Greg wrestles the wheel away from Jimmy and injures Christine when he stops short for a squirrel-shaped paper bag. By the time she's seen a doctor (twice), it's Sunday afternoon and everyone, including Jimmy, wants to turn around. But Greg refuses to until he's seen the Grand Canyon. By the time they get there, it's Sunday night and they can't see it. The others remind Greg that all family vacations suck, so he makes amends with Jimmy. As they have to work on Monday, Greg throws Jimmy the keys -- which fall right down the Grand Canyon.