Things to do on two 12-hour car rides?

I have an iPhone with lots of games (although suggestions for that are good), it'll probably last me about 5 hours (maybe). I may or may not be able to fully charge it in between the two rides. I will have a bunch of my friends in the car with me, and we will stop multiple times (if that makes a difference). We have lots of books and magazines I can bring, and I can read for about a half-hour at a time without getting sick. My friends will probably bring food, water, and iPhones, iPods, etc. I will not be able to buy anything, (besides iPhone apps) between then and now. Also, I'm bad at sleeping in cars, and this will be in the middle of the day, so I most likely will not be able to sleep.
I'm planning on bringing:
iPhone (with multiple pairs of earphones, earphone splitter, speakers, usb cord, car adapter, etc.)
A book and maybe a few magazines
A couple notebooks and lots of writing tools (pens, pencils, etc)
LOTS of water and food
What should I do to entertain myself with my friends? ANY ideas will be GREATLY appreciated!

You can bring games and cards. And don't worry cause with your friends you won't get bored just talk and enjoy being together

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