Mr. and Mrs. Crabbe are enjoying their seaside vacation . . . until a certain dog blows away their umbrella with an enormous fart. Before long, Walter is banned from the beach. While stuck inside the beach house, Walter snacks on a sack of strange-looking tropical fruit labeled Cook Thoroughly. Meanwhile, Betty and Billy hunt for treasure out on a sandbar. As soon as they find a nickel, Mr. and Mrs. Crabbe elbow their way in. All four get marooned during high tide. Will Walter hear their cries for help? And why did that tropical fruit have to be thoroughly cooked?