Bouncing into the weeds from the back of a pickup truck, a little blue and yellow raft begins a day of adventures on a river of the Chesapeake Bay. Originally intended as a birthday present for a water-man's son, the raft is found by a couple of fun-loving children and becomes their pirate ship. Later it serves as a pool for a noisy brood of ducklings and a circus tent for some excited young muskrats. And that's only part of the raft's wanderings before the boy and his extra-special present are united.