Well if I don't die from the resulting tidal effects of the moon coming close that I imagine we'd have, I'd probably quit my job and stay move in with my boyfriend, play all the video games I haven't had time to yet but wanted to, download the Cataclysm expansion of WoW and hope I get to play a little of it before impact, play from Zelda songs on my OoT replica in some vain attempt to buy more time, hope that Piccolo or Simon or some other fictional character show up and do something about it....that'd be more near the end when I can make out the creator on the moon mind you.
tl:dr-Get out my Ocarina of Time replica and start playing every Zelda song I know in hopes that I can summon Four Giants or the Windfish or something else large/powerful enough to smack the moon back into proper orbit.