A playground closes down for a safety check-up. When Cito sees the little buses are upset, he remembers that when he was little there was a secret playground where he used to play, up in the mountain.
He talks to Pat and Billy who used to play there with him. Cito decides to invite the little buses to his secret playground. While they try to find the exact location, Cito, Pat and Billy are delighted to look back on their happy childhood memory.