Duty:
* Make sure that if I do nothing else, and barring a collapse of society, I don't have to work for anyone else again.
* Make sure my wife can stop working for others, too.
* Make sure my daughter can afford to go anywhere for higher-education. If she doesn't want to go to school, provide her the ability to try startup ideas.
* Make sure my parents and parents-in-law are looked after.
* Keep my relatives provisioned with computers, and buy my Dad copies of Mathematica and Matlab.
* If I have sufficient funds, make sure my relatives can study anything/anywhere they want, as long as their marks are sufficient.
* Prepare to leave some money to various causes.
Fun:
* Actually spend the summer playing tennis, instead of in crunch mode.
* Take my parents to Wimbledon, the French Open, the US Open, and the Australian Open.
* Re-activate my Scuba licence, and spend some time diving.
* Go sky-diving
* Go on a "shooting range tour" where I fire all those guns you only see in games and movies, and to some kind of CQB training.
* Learn to fly a plane
* Learn to fly a helicopter
* Re-learn how to ski and spend more time doing that.
* Spend more time playing piano. Maybe learn the cello, the violin, or guitar.
* Spend some time in extremely remote locations, like the high-seas, in mountains, or underground.
Non-Commercial Research:
* Read even more. Make sure I've read the classics.
* Spend a few years really learning Physics, at least up to EM with relativistic effects, QM, and GR.
* Learn cell and molecular biology fundamentals.
* Research Superconductivity.
* Research computer vision, motion control, learning, and memory.
* Research and implement a lifestyle that maximizes my own cognitive abilities, even if it's eccentric.
* Re-learn French and German. Learn Mandarin and Japanese.
* Research and implement programming languages.
* Research meta-programming.
Make:
* Build a legged tele-operated or autonomous robot.
* Build a submarine
* Start or contribute to open-source projects in games, simulation, and education.
* Start a game studio.
* Become a competent illustrator
* Make an animated short.
* Make a smart sci-fi film
* Build a virtual CAVE.
... you get the idea ...