Sizzle Beach, U.S.A.
Sizzle Beach, U.S.A,, also known as Malibu Hot Summer, is an independent film directed by Richard Brander and starring Robert Acey, Kevin Costner (in his debut), Terry Congie, Leslie Brander and Roselyn Royce. It was not released until 1986 after Costner became a celebrity. His biography says it was filmed between 1978 and 1979. It was referenced in the Mystery Science Theater 3000 episode Alien From L.A., but was never parodied on any incarnation of this show itself.
Three young women team up to rent a beach house in Malibu, California: One of them lands a job in a high school thanks to an investment broker she meets jogging along the beach, another is taking acting lessons and enjoys horseback riding, though the young owner of the stable, John Logan (Kevin Costner), turns out to be more interesting than the riding itself and the third woman practices her guitar, shuns the owner of the studio where she records, and hangs out with her hunk cousin Steve, the fourth roommate in the house.