Download audiobooks online and play them on your iPod dock in the car.
Pack alphabet magnets for your child to play with on a metal baking pan.
Start a scavenger hunt. Have him look for a dog in a yard, a construction cone, and a baby in a stroller. On the highway? Look for a car with another kid in it, a yellow billboard, and a dirty truck.
Broaden the search. See if he can spot things you can eat, wear as a hat, or use to decorate your living room.
Make up songs and stories about objects you pass. "See that moving van? I think the people are moving to the North Pole!"
Count blue cars. When he sees two, tell him to count clouds. When he finds three, switch to finding four green signs.
