From his Hollywood home, Errol Flynn copters to La Jolla's Scripps Institution of Oceanography for a few days. Inspired by the sight of a pod of gray whales, Flynn, his father (an oceanographer), and Dr. Hubbs from Scripts take Flynn's schooner, the Zaca, for a specimen-collecting trip down the coast, through the Panama Canal, and on to a southern port in Jamaica. Flynn's wife Nora joins them; his dad, Hubbs, and John Decker, an artist, turn the Zaca into a floating research lab. The Flynns take a raft for a day trip upriver to a Jamaican waterfall. There's an evening of dancing, then it's back to the sea.