Real estate. Maybe I'd start my own trailer park. Friend of a friend lives in one and the landlord hands out speeding tickets, pretends its his own personal fiefdom. I think I'd like that. I'll name all the little streets after characters on "Dukes of hazzard." There will always be people who need affordable housing in good times and bad and I figure as RE goes this is as down-to-earth as it gets. I'd get some hilltop property too so I could run a wind farm, my satellite dishes could "see" both horizons, I could watch the sun rise and set, and I could whip out my binoculars and watch my trailer park on the flood plain below.
If I had scads of money I'd buy my employer and turn the place around, cut some dead wood, turn a profit, and flip the joint a few months later.