What to do on a plane for 5 hours?

I am 12 years old and flying to Cali with my little sister(10 years old), my mom and my dad. I have a I pad I am going to bring,DS,books,mp3 player,camera, I am bringing a blanket and a pillow to sleep with and my plane has no movie. I am bringing my portable movie player though.Me and my sister get bored REALLY quickly and I don't know if this stuff will hold us for 5 hours. Any other ideas??????