...not start a new family, let the lineage end with you. You and the stranger die old and alone, but at least no new generations will have to suffer the isolation and primativeness of the island life.

...have at least one child, immediately. You can't bare the idea of dieing alone or you can't imagine going through life without someone to take care of.

...start a new family to keep the lineage alive. You will teach the children of the wonders of civilized life and foster their hope of being rescued some day.

...start a new family in hopes to populate the island. You do not teach anything about the global world so as to let them have peace in their isolation and ignorance.

Other: