Tony Marvin, who works in advertising at J. P. Todhunter's Imperial Pineapples in Hawaii, designs a publicity stunt involving the selection of an "Imperial Pineapple Girl," who is to come to Hawaii for three weeks of romance and then publish her impressions of the trip. After Georgia Smith, the chosen girl, threatens to return home early when her glamorous trip to Hawaii proves uneventful, Tony is picked to romance her. As Georgia leaves her hotel for the home-bound ship, a stranger, hired by Todhunter, asks her to smuggle a necklace to San Francisco for his sister. Inside the necklace is a stolen, sacred black pearl, which the stranger says must be returned to the islanders in order to appease the goddess of their volcano, which has started to smoke. Georgia and her stenographer, Myrtle Finch, and Tony and his friend, Shad Buggle, are all obliged to sail to a nearby island and return the pearl. The island ceremonies and moonlight enchant Georgia, and she falls in love with Tony, unaware that he works for the pineapple company. Tony, meanwhile, has been calling in installments of the Pineapple Girl's impressions for the island's newspapers, which he has written himself. After the High Priest prays for the acceptance of the pearl by the goddess, Tony and his friend Kimo order the islanders to create a fire beneath the volcano to make it look as if the pearl was fake and the goddess is still angry, thereby promoting further adventures for Georgia. Eventually, Tony, Georgia, Shad and Myrtle escape from the island in Tony's boat and head for the mainland. Tony tries many times to confess to Georgia his part in the pearl scheme, but cannot get up the nerve. As they approach the mainland, he proposes to Georgia and tells her to put on her best dress for an immediate wedding. Meanwhile, Georgia's hometown fiancé Victor, a dentist, and her Uncle Herman have flown to Hawaii to save Georgia from the duplicitous Tony and the dangerous islands. Although by now Tony is pleading with Todhunter to publicly deny the authenticity of the Pineapple Girl's articles so that Georgia will accept him, Victor convinces Georgia that Tony deliberately exploited her. Todhunter refuses to cooperate with Tony, and he is forced to quit. Georgia refuses to believe Tony is in love with her and, oblivious to his attempts to win back her trust, boards the ship for home. Finally, Tony sends an old woman onto the ship to pose as his mother. The woman asks Georgia if she loves Victor and tells her not to let her pride keep her from the man she really loves. Georgia runs off the ship just in time and, although she discovers the woman was a hoax, kisses Tony anyway.