A new-look team featuring four Olympic gold medallists, five debutantes and three recalled former internationals defeated Samoa 28-19 in the men's final, having dispatched American Samoa, Papua New Guinea, Nauru and Tonga in pool play and Australia in the semi finals.
Interim coach Naca Cawunibuca said the team was on an extended honeymoon for a long time following their success in Rio.
But after spending only a fortnight together in camp, he said their performances at the weekend were encouraging.