I've done two major road trips with my kids... I guess they are trained to never say "are we there yet".... and most of the trips during daylight, I won't allow games... I wanted them to see this land. (I do realize they're older than your kids)
Here's some of one.
http://forums.clubtouareg.com/ftopic998.html
Here's some of one.
http://forums.clubtouareg.com/ftopic998.html