A successful businessman in Hawaii disappears amid allegations of illegal activities. Years later his four sons bear the burden and repercussions of these allegations, as well, taking care of his legacy. Now when a stranger comes all sorts of things happen like a secret that their father kept from them and the truth of their father's disappearance.

In the second of three additional Gilligan's Island movies following the series, the gang finds a way of getting rescued from the "uncharted desert isle" for a second time through a series of misadventures but comes back to turn it into a tropical resort for uptight mainlanders.