Supreme Court Justice (its a good gig if you can get it). More realistically -- because I'd never pass the Senate Confirmation -- District Attorney or Federal Prosecutor.
Or billionaire crimefighting vigilante.
Or maybe both.
Don't forget the mask. A cape isn't required, c.f. The Flash, Ironman, Daredevil, and Mr. Incredible.
Similar to Jack's comment, I'd be a multi-billionaire by the age of 25. I'd spend enough money to retire and enjoy life......and spend the rest of it making the world a better place.
Golf course critic/reviewer, or golf club tester, or pretty much anything that would require me to play golf.
Otherwise, a scholar (not sure exactly what you'd call it). I'd love to be paid to sit down and learn something new every day.
Right now I have been doing a lot of research into management consulting, wouldn't mind finding even ethics consulting gigs.
Basically anything where people seek out my opinion and not only do they pay for it(very well) but they actually implement it and listen to it at the executive level
Oil Exploration Engineer, area of focus ----> West Africa.
Historian, jazz bassist or owner of the hippest joint this side of 52nd Street.