I'd probably do following:
Race cars, play video games, rental properties, invest while having the profits go to a charity of my choice, travel (bike long distances, walk the earth, fly), run huge lan parties, try to conquer a few fears I have, build skate parks and bmx tracks, start my own sponsorship company for extreme sports for newcomers, start a blog website and post random rants, freelance writing or article/newspaper writing, make a movie, make music, make a website from scratch that doesn't suck, hire a bunch of friends and people I know to get them away from jobs they hate, build computers and try beating overclocking records, fix cars, play tennis and badminton, join a discovery team to discover new life or land, cater to elderly who have nobody left in their lives, detail high end cars at my own pace, talk to people, work people to find a cure for tinnitus and other annoying problems, attend all of my favorite bands concerts, get a college degree in Financing or Accounting to learn how numbers come together in businesses, learn how to do a back flip, learn karate or take self defense classes, lift weights, read books, design audio equipment mainly speakers, learn about the brain and body in humans as wells as other animals.
When I'm not doing the above, hopefully when I'm old, I'd spend time with my wife somewhere peaceful where there's no worries or loud noises.