Riff takes apart BJ's plane out of curiousity and they build a boat on the play set for Baby Bop.
Airplanes: BJ brings his brand new toy plane to the park. Riff borrows the plane while BJ is off playing. Unfortunately, curiosity gets the best of Riff and he ends up taking the plane apart to see how it works. Luckily, BJ isn't mad when he finds out. Instead, he shows Riff how to put the plane back together again. Boats: Baby Bop is having a great time playing with her homemade boat. However, what she really wants is to ride in a big boat. Barney takes her to look at boats on the computer while BJ and Riff work on a big surprise for her. When Barney and Baby Bop return to the playground, they discover that BJ and Riff have built a sailing ship on the play set for Baby Bop!