You doubt anyone is looking for you, but maybe a ship will sail by or a plane will fly overhead. Thinking back to seeing a few stranded movies and tv shows, you try and be smart and deceide to go make an SOS message in the sand.
Half an hour later you have a nice stone SOS written in the sand. You feel proud but you are still where you started, only now, you are hungry, thirsty and more worried about your friends.