The Hunger (but mostly Death) Games?
Honestly, I'd make eye contact with everyone I could before it started to see who was just as pissed off about having to be there as I was. When everything started, I'd calmly walk over and pock a squat on the grass a few meters away and call out to anyone intelligent enough to exercise awareness.
Assuming there were any number of us worth the lives we had - we'd band together and stage a little revolution.
If not, I'd play it largely alone, at first. Skirting the periphery. I'd poison water and food supplies as available - harass organized groups with fires and traps. Eventually I might form some kind of alliance - though my masculine instincts are naturally distrusting of other males - so it's quite likely that I'd end up with all female company (and one of them would most probably kill me before succumbing to infighting).