 Fred wants to bring everyone on vacation, but Wilma wants to stay home. In order to make up for Fred s request to go away on a holiday, Wilma secretly rents the house to a Swedish music band. Fred rents a trailer and brings them to "Jellyrockstone Park". But unexpected things (including a picnic basket snatched by Yogi Bear !) happens and despite Wilma s requests, he returns home with the family...