"Gidget," released in 1959 and directed by Paul Wendkos, is a beach movie that manages to be thoughtful without being silly. It centers on a 16-year-old girl—played by Sandra Dee—who finds herself drawn to a group of surfing guys in Southern California, specifically Malibu. Cliff Robertson portrays Kahuna, the leader of this group, who acts as a mentor to the young protagonist as she attempts to catch the eye of Moon…