Having it all planned down to the last detail, the American, well-meaning paterfamilias, Clark Griswold, and his supportive wife, Ellen, take their two teenage children, Rusty and Audrey, on a cross-country trip from the suburbs of Chicago, all the way to sunny California's Walley World amusement park. However, anything that can go wrong will go wrong, and before long, Ellen's cousin, Catherine, and her husband, Eddie, enter the picture, and Clark is on the verge of blowing a gasket. Now, Roy Walley's wonderful park seems so far away, and even though the prospect of a clandestine meeting with the alluring blonde in a fast, 1981 Ferrari 308 GTSi sounds tempting, Clark must do the right thing, and find the promised land. How hard can it be to have the perfect vacation?