Walley World has always held a special place in the heart of Rusty Griswold. To relive his childhood and bring some of that nostalgia to his family, he decides to take them on road trip to that fateful amusement park just like his own dad did when he was a youngster. They rent an SUV and hit the road for a family-bonding session that sees plenty of hilariously disastrous moments along the way.