Survive as long as possible and build up your island with the given materals and hidden buildings and chests.

Download instructions: Mac- open finder do command+shift+g and type /users/your user/Library/Application Support/minecraft/
then put the world save in your saves folder that is in minecraft.

Download instructions: PC- go to start and type &appdata% go in the .minecraft folder then put the minecraft world in your saves folder that is in minecraft 

Special thanks to Makailasaur