Francis, now 17, is still in love with Moondoggy. She can persuade her parents to allow them a journey to Rome, together with two of her and two of his friends. However they have to take an adult with them, so they choose Peter's eccentric aunt. In Rome they get the beautiful guide Daniela, who's fascinating the guys and making especially Gidget jealous. She starts looking elsewhere herself.
Francis is desperate: her parents want to force her to come with them on vacation to Hawaii - just during the two weeks when her beloved "Moondoggy" is home from College. When he suggests her to go for it, she's even more in panic - doesn't he care to be with her? So she sets out for Hawaii in the worst mood. On the plane she meets the sociable Abby, who gives her the advice to forget about Jeff - and regrets it shortly after, when Francis follows the advice and steals her boyfriend Eddie, a famous dancer. But then Jeff discovers he's missing Francis...
Gidget finally gets married and rebels against the social caste system in her new husband's company.
