Car, motorsports, and speed enthusiasts with money, business experience and a need to "do something new"; this is the something new you've been waiting for. You just didn't know it. The Sandia Motor Speedway is for sale on eBay. The current bid is a few bucks shy of US$ four million so this isn't likely to be an impulse purchase. But a trip to Albuquerque to look it over (on your way to Edwards for the X-Prize attempt maybe?) would be fun. They've got some terrific southwest restaurants in town and the weather is perfect for motorcycles, convertibles and light planes. Why are you still reading this?
Short of owning a general aviation airport, I can't think of a better way to make a small fortune -- out of a large one.