Why a burro on the beach? Old Captain Joe's venerable mule, A.D., is there to rescue cars stuck in the sand but Amigo, the Spencer's pet burro, fools him into thinking he's young again and ends the career of his old age in one wild chase across the beach. After this mishap the three Spencer children add The Salvation of the now-unemployed Captain to their already long list of projects for this first seashore holiday; they also have to train Amigo, fish off the sand bar, and find a Japanese float; Ted, the eldest, even has a secret cave to explore with his best friend Don. ""'I'm so glad Ted found a friend,'"" remarks Mrs. Spencer to Don. ""'He's like a fish out of water without his pals. Watch out, though, or he'll attach himself to you like a barnacle.'"" Even the most patient beachcombers will find the amusement buried too deeply in the sands of turgid style and excessive sentiment.