It's Timmy and his friends' first ever trip to the Seaside - and Osbourne and Harriet are going to drive them there in the Nursery Bus. Everything is packed - sun hats and sun cream, picnic, buckets and spades, beach balls, fishing nets and guess who's stowed away in the luggage rack...? Bumpy the Caterpillar! Seatbelts on and singing a song, they set off for the Seaside. Once at the beach, Timmy and the gang are very excited as they have their first paddle in the sea. Mittens doesn't like being splashed but she loves collecting shells. Otus builds a magnificent sandcastle. And typically, energetic Timmy does a bit of everything along with his beloved Teddy. One minute he's burying Harriet in the sand, the next he's digging channels around Otus' castle, and the next he's exploring rock pools with Kid and having fun with the crabs. When Timmy discovers an old rowing boat on the beach he imagines himself sailing on the open seas. He makes a little raft for Teddy and lets it sail around ...