Survivor of Eschewal

You were travelling on a luxury liner enjoying a little holiday when suddenly the ship is hit with a heavy weapons blast and you are thrown clear into the water. You are swimming for your life in the dead of night with nothing but the clothes on your back. Suddenly you wake up and find yourself on a beach of a strange island. This island does not feel right from the start because you could have swarn this island was not here the previous night. Now all you can think of is getting off this island...