Sid Boggle (Sid James) and his friend Bernie Lugg (Bernard Bresslaw) are partners in a plumbing business. They take their girlfriends, prudish Joan Fussey (Joan Sims) and meek Anthea Meeks (Dilys Laye), to the cinema to see a film about a nudist camp called Paradise. Sid has the idea of the group holidaying there, reasoning that in that environment their heretofore chaste girlfriends will relax their strict moral standards. Sid easily gains Bernie's co-operation in the scheme, which they attempt to keep secret from the girls.
They travel to the campsite named Paradise. After paying the membership fees to the owner, money-grabbing farmer Josh Fiddler (Peter Butterworth), Sid realises it is not the camp seen in the film, but merely a standard family campsite. To add to their disappointment, it is no paradise but instead, a damp field; the only facilities being a very basic toilet and a washing block. They reluctantly agree to stay there after Fiddler refuses a refund and the girls approve of the place. There is further disappointment when the girls will not share a tent with the boys.
Sid and Bernie soon set their sights on a bunch of young ladies on holiday from the Chayste Place finishing school. The ringleader of the girls is blonde and bouncy Babs (Barbara Windsor). In charge of the girls is Dr. Soaper (Kenneth Williams), who is fervently pursued by his lovelorn colleague, the school's matron, Miss Haggard (Hattie Jacques). The girls soon leave for Ballsworth Youth Hostel, where Babs and her friend Fanny (Sandra Caron) change the room numbers on Dr. Soaper's and Miss Haggard's doors and convince Dr. Soaper that the female washroom, where Miss Haggard is, is the male washroom. Dr Soaper leads an outdoor aerobics session, during which Babs' bikini top flies off; he catches it.
Other campers are Peter Potter (Terry Scott), who loathes camping but must endure his jolly yet domineering wife Harriet (Betty Marsden), with her irritating laugh, and naive first-time camper Charlie Muggins (Charles Hawtrey).
Chaos ensues when a group of hippies arrive in the next field for a noisy all-night rave led by band The Flowerbuds. The campers club together and successfully drive the ravers away, but all the girls leave with them. However, there is a happy ending for Bernie and Sid when their girlfriends finally agree to move into their tent. Their joy is short-lived when Joan's mother (Amelia Bayntun) turns up, but Anthea lets loose a goat that chases Mrs Fussey away.
Sid James as Sid Boggle
Kenneth Williams as Doctor Kenneth Soaper
Joan Sims as Joan Fussey
Charles Hawtrey as Charlie Muggins
Terry Scott as Peter Potter
Barbara Windsor as Babs
Bernard Bresslaw as Bernie Lugg
Hattie Jacques as Miss Haggard
Peter Butterworth as Joshua Fiddler
Julian Holloway as Jim Tanner
Dilys Laye as Anthea Meeks
Betty Marsden as Harriet Potter
Sandra Caron as Fanny
Trisha Noble as Sally
Amelia Bayntun as Mrs Fussey
Brian Oulton as Mr Short, the camping store manager
Patricia Franklin as Farmer's daughter
Derek Francis as Farmer
Michael Nightingale as Man in cinema
George Moon as Man at campsite
Walter Henry as Man in cinema
Valerie Shute as Pat
Elizabeth Knight as Jane
Georgina Moon as Joy
Vivien Lloyd as Verna
Jennifer Pyle as Hilda
Lesley Duff as Norma
Jackie Pool as Betty
Anna Karen as Hefty girl
Sally Kemp as Girl with cow
Valerie Leon as Miss Dobbin, the camping store assistant
Angela Grant as Schoolgirl (uncredited)
Peter Cockburn as Film Commentator (uncredited)
Gilly Grant as Sally G-string (uncredited)
Michael Low as Lusty youth (uncredited)
Mike Lucas as Lusty youth (uncredited)
Alf Mangan as Camper (uncredited)
David Seaforth as Camper (uncredited)
the 17th release in the series of 31 Carry On films (1958–1992).