How can i make a very long car journey seem quicker and more fun?

I am going on a very long car journey (aprox 2 days) and I do not find it very easy to sleep in the car for more than an hour at a time even though it makes me very sleepy. Other than listening to music, playing I spy and similar normal games, what else can i do to make it more fun and make the time pass quickly? Otherwise I end up watching the clock for the entire time! (btw i am a passanger and am not an adult)