Little Critter and his grandmother embark on a seaside adventure, traveling by bus to spend the day at the beach together. What unfolds is a series of humorous mishaps and gentle moments—from a windswept umbrella incident and a wayward kite, to dropped hot dogs and an unexpected encounter with a crab. As the day progresses, the pair share snorkeling, build sandcastles, and enjoy simple pleasures together, though Little Critter learns a bittersweet lesson when the ocean washes away his creation. By evening, as they ride the bus back home with Little Critter drowsy from the day's excitement, both grandmother and grandson reflect on the joy of their time together, finding comfort in each other's company.