Our family just returned from our first short-term mission trip. We drove three hours to His Mansion, located in New Hampshire. We do not have a television (that works) in our car and although my boys are definitely in the minority, they do not own a Nintendo DS. So they read. Ate. Looked out the window. Teased one another. And asked plenty of times "Are we there yet?"
My youngest, Noah, even busied himself by imitating a GPS voice. We pulled over for an ice cream break after only an hour of driving and he said, with all seriousness, "Arriving at destination."
What does your family do on long car trips?