i would exactly recreate the scenarios in last stand and last stand 2 (after all, the situation is the same). i would not give up without a fight, even though i would not (or rarely) sleep because i would be scared like hell. i would live off the idea that there are others just like me elsewhere trying to find each other and i would try to gather them all while killing as many zombies that come in my way. i don't hate to admit it, but before doing all this, i'd probably just hide inside the helicopter and cry for a couple of hours... wow, i've never given anything like this this much thought! :-)