I would buy me an IN-n-OUT burger joint (if only that was possible)
But with a 1 mil, I'd settle for a McDonald's franchise.
According to the 2008 statistics; at the height of the recession McDonald's served more than 27 million individuals daily. That's what I'd call a Recession Proof Market.
Just invest it. You can easily make 5% a year off the right investments. I would just continue to work and let the intrest continue to roll over and compound. By the time I was 65-70 I would have 10 million easy off that.