...All of my friends have told me they would kill me first. I was confused as to why until they said, "Because if we didn't, you would kill us. In our sleep. You look harmless but you're not."
Which is, um, true. The "killing everyone in their sleep" thing, at least. I would try to make a group to keep us alive as long as possible and safe from others (all the while we're doing things like luring people in to traps; someone is bound to have gotten a range weapon and I am all shooting people from trees), and then kill everyone in their sleep (prolly by suffocation or something else quiet--no guns or screaming to wake others up. If I found the poison the girls had in the book and movie, guess who is cooking the last night.)
I would fully be expecting people to doublecross me, after all. Especially after, when asking, "So what would y'all do on BR Island?" being told, without a moment's hesitation, "Kill you first."
So provided I made it through the first hour on the island alive, yes. Assemble a group, assign all of us duties--lure, guard, person in a tree with the gun or crossbow, etc, etc--and then kill everyone in their sleep after we had taken out everyone else.