Let's see...

1. Eh, I wouldn't choose anybody. Screw repopulating. I'd much rather be by myself, thank you very much.

2. I'm sure the universe would fuck me up the ass one last time and leave just me, my ex, and the husband she left me for. And... now I'm depressed.

3. If #2, then I would either commit suicide or... have them commit suicide. By force.

If it's just me (either through #1 or certain outcomes of #2), then I suppose I would travel the world to the best of my ability. Surely I could get a luxury yacht to work, right? And even if I can't steer it properly, it's not like I won't have plenty of ocean to sail it in. At any rate, I'm sure they'll be enough canned food around to get me around the world. I'll see everything there is to see, watch as many movies, read as many books, and then, when there's nothing else to do, kill myself.