do you know for sure that there is no one else in the world? or do you just wake up one day and there's no one around right there? cause if you don't know for sure, i'm pretty sure i'd go and gather supplies... maybe find a vehicle.. some weapons (just to look like a badass) then drive around looking for people.. then maybe after a month of searching, i'd realize there was no one around, then i'd just run around naked or something.. then after that fun, i might try to find cool places and try to get access to area 51 or some other heavy security/top secret area.. like bill gate's house or something... that would be pretty fun for a while.. then, when i got tired of being alone i might give flying a f22 raptor a try.. or maybe an apache heli