1) Tell no one but my wife, and a financial planner that I won the lottery
2) Pay off Mortgage, student loans, car payment, credit cards ASAP
3) Wife would quit her job and start up a small farm business on our 5 acres
4) I'd probably keep working my current job for a little while... I'd get bored if I didn't. I'm a professor, so I can take summers off and get winter break off anyway.
5) Travel a LOT. Buy good food and booze.