Survive on an island where every body wants to get you!

Survive on a custom made island (VERY LARGE) but with a twist! everybody is out for each other!
Rules:
Dont grief! (except for torches)
Dont spawn camp!
Dont cheat!
DO! Kill anybody you come across!
DO! make alliances and help each other
(DO betray eacho ther as well >:D )
DO! make what ever death contraptions you like!
DO! raid other people!
AND you CAN! break blocks/mine/hunt mobs/hack wood/dig dirt/whatever!