We just finished our last vacation for the summer and had to drive 9 hours to our destination. It is a very long car ride with kids so I packed plenty of toys, books, and games. My four year old really likes to play I Spy games. I found some to print out from here and here.
Both my four year old and almost two year old love construction vehicles so I also made this I spy game for them to play. I tried to make it a little more entertaining by also having it by a color page as well. Of course the almost two year old didn't quite understand the game, he enjoyed just coloring but it was a big hit with the four year old.
Download your copy here.