Not a cruise, too many ways to escape, even if your inside, I would say something that's underground, or somewhere that's liable to trap you no matter what happens or if you try to escape, like a snow top fortress where you could freeze to death if you went outside, or something like the Sierra madre from Fallout new vegas where there was poisionous gas covering the entire area, something of that sort, Or a giant bio dome that keeps us from the outside world.