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Beaver (Jerry Mathers), Wally (Tony Dow), and a few friends have built a kayak in the Cleavers' garage. Though Ward (Hugh Beaumont) and June (Barbara Billingsley) admire the boys' industriousness, they forbid Wally to sail the kayak in Miller's Pond. As it turns out, Wally can't sail it anyway, because he's too big to fit in the vessel -- but Beaver isn't! After Beav gets a good dunking, he and Wally are faced with the formidable task of preventing their parents from finding out that they've disobeyed orders.