After accidentally ruining his friend's soccer game, Curious George enrolls in a soccer camp where he learns about the rules of the game and makes some mischief for the team.
While on a field trip to a fire station with Mrs. Gray's class, Curious George goes off on his own and is soon at the scene of a fire, where he finds a way to be helpful.
When the man with the yellow hat tells George that he is planning a surprise, of course George is curious. Before long George finds a hat, noisemakers, decorations, and games. It must be a birthday! But whose birthday is it? That's the surprise!
Separated from the man in the yellow hat while at a Christmas tree farm, Curious George ends up at a hospital where he delights the child patients with his own brand of tree trimming.