One fine day the family is going on a car trip. Daddy says he doesn't know where they're going, they'll just see what they can find. Caillou thinks this is very strange and isn't sure it will be any fun at all. After playing a car game, they stop at a gas station for lunch and Caillou sees a really big truck. Then they ride on a ferry boat, and the captain lets Caillou blow the horn. Caillou decides that car trips are even more fun when you don't know where you're going!