How will Gregory find his way back to Dad? Swish-swoosh . . . Gregory draws a lion in the sand. ''Don't go in the water, and don't leave Sandy,'' warns Dad. But the sandy lion grows a tail that gets longer and longer and soon Gregory is lost on the beach. This wonderful read-aloud book brings to life a summer experience that is all too familiar for young children. Karen Williams's rhythmic text has been paired with Floyd Cooper's brilliant illustrations, revealing the trip down the beach entirely from a child's point of view. A gentle father-son bond is shown in both text and art, reassuring young readers even as they share in Greg's moment of worry at finding himself lost and alone.