Call me spiteful (or a team player, depending on which side your on now!), but a good few augmentations could make me a much better zombie! First things first, a good helmet, something like the Maska-1Sch [http://www.airsoftnews.fr/wp-content/uploads/2009/02/maska-1-550x412.jpg], would make those pesky headshots a thing of the past. No need to risk loosing it, so sealing myself in would probably be worth a few minutes. Then something like knife-hands, or a way to look slightly less zombie-ey from a distance, so people will try to get close and find out if I'm a zombie or not, rather than trying to pick me off from a distance.
Then I'd probably spend my remaining time enjoying being a zombie. I could probably infiltrate a group of survivors while still being able to pass myself off as human, and find a way to infect them. Then break a few barricades or something. (That's what people do in the zombie apocalypse, right? Build barricades? I mean, it's not part of my plan, but that's what other people do, right?). Finally, I'd pre-record a radio message about survival, put it on repeat and broadcast it somewhere near me, to make sure plenty of meat comes my way =)