I'm older than most everyone here, so I only get a limited time to do my own thing (when the wife and kids go to bed). I'm typically working or playing with my kids.
So what I do when I can't play U3 is play Madden 13 (not a good game). I play CoD: BO and KZ3 as well. But I'm basically done with those games. When I'm bored with gaming I xatch up on all my stuff on the DVR: The Daily Show, Colbert Report, Walking Dead (best show), South Park, Tosh.0 and of course the NFL. I'm always too busy to do fun stuff outside like I used to. Basketball and fishing.
Do your homework. Use this time wisely. You can do homework, watch TV, watch YouTube videos, go out with your friends, visit this forum etc. There's lots of things to do when you can't play Uncharted 3.