Leaving your real legacy behind you....what an idea.
Write your own memoirs, or get some thoughts down using a tape recorder. Put captions on the photos you have taken, never mind stuffing them in a box some where. With today's technologies it easier to record your past positions, your families celebrations and many wonderful memories to tell about "you".
I get so much entertainment and pleasure when looking at my past snapshots from the years in raising my children. Or the old photos from high school or college years. In other words, leave your mark behind for future generations to come.