Clark Griswold, wanting to spend more time with his wife Ellen and children Rusty and Audrey, decides to lead the family on a cross-country expedition from the
Chicago suburbs to the
southern California amusement park Walley World, billed as "America's Favorite Family Fun Park". Ellen wants to fly, but Clark insists on driving so he can bond with his family. He has ordered a new car in preparation for the trip, but the shady dealer claims it will not be ready for six weeks. Clark is forced to buy the "Wagon Queen Family Truckster", an ugly, oversized
station wagon after the car he traded in has been crushed. During the family's travels, they experience numerous mishaps, such as being tagged by vandals after taking a wrong turn in
St. Louis, Missouri. Clark aggravates a bartender in
Dodge City, Kansas, and is tantalized on numerous occasions by a beautiful young woman driving a
Ferrari 308 GTS. The Griswolds stop in
Coolidge, Kansas, to visit Ellen's cousin Catherine, her lazy, unemployed husband Eddie, who foist cranky Aunt Edna and her mean dog Dinky on the Griswolds, asking them to drop her off at her son Norman's home in
Phoenix. After stopping at a decrepit and dirty campground in
South Fork, Colorado, for the night, Clark forgets to untie Dinky's leash from the rear bumper before driving off the following day, killing the dog. A motorcycle cop pulls the Griswolds over and angrily lectures Clark over
cruelty to animals, but accepts Clark's apology. Edna learns of this and becomes irate with Clark for killing her dog. Leaving Colorado, Ellen loses her bag with her credit cards, and Clark reports them as lost. While Ellen and Clark argue during a drive between
Utah and
Arizona, they crash and become stranded in the desert near
Monument Valley. Clark sets off into the desert to look for help, but becomes lost. He reunites with his family, who have been rescued and taken to a local mechanic. The mechanic, who is also the town sheriff, extorts Clark's remaining cash, only to render the car barely operational. Frustrated, the family stops at the
Grand Canyon. When Clark cannot convince a hotel clerk to cash a personal check because his own credit cards have mistakenly been reported lost, he raids the cash register behind the clerk's back and leaves the check. Continuing their drive, the Griswolds find that Aunt Edna has died in her sleep. They tie her body to the roof of the car, wrapped in a
tarpaulin. Discovering that Norman is out of town when they arrive at his home, they attach a note to the body and leave it in the back yard with an umbrella. Overwhelmed by the mishaps they have encountered, Ellen and the children want to go home, but Clark has become obsessed with reaching Walley World. After an argument with Ellen, Clark meets the Ferrari-driving blonde at the motel bar, and swims naked with her in the motel pool. Clark's screams of the cold temperature alert the family and they are embarrassed by the situation. Ellen forgives Clark, and they go swimming naked as well. When the Griswolds finally arrive at Walley World, they discover the park closed for repairs for the next two weeks. Slipping into madness over his efforts being for nothing, Clark buys a realistic looking
BB gun and demands that park security guard Russ Lasky take them through Walley World. An
LAPD SWAT team soon arrives, but as the family is about to be arrested, park owner Roy Walley shows up to de-escalate the situation. Roy understands Clark's longing to achieve the perfect vacation, bringing back memories of his family vacation troubles. He decides not to file
criminal charges against the Griswolds and lets the family and the SWAT team enjoy the park as his guests. The credits show a montage of snapshots taken during the trip, ending with one showing the Griswolds flying back to Chicago. ==Cast==