One perfect blue-sky day, Miffy and her father and mother decide to go for a summer picnic at the beach. When they arrive, they see that Boris and Barbara Bear, Auntie Alice and Aggie are also there! They eat and sing, while Aggie plays the accordion. They don't notice the waves coming closer and closer. Miffy's room is so messy, that she can't find her schoolbag. Boris' workshop is also untidy, so he can't find his tools. He decides to put everything in its proper place, and goes to the school to make some new tables. He meets Miffy there and they both discover how important it is to have everything in its right place.