1. quit my job
2. Give each of my close friends & family members $100,000.00.
In hopes it will help with any immediate financial burdens they may have.
They know best what they would like/need to put the money towards.
3. Buy a new vehicle
4. Buy a nice house to live in while my "dream house" is being built
5. Have a HUGE party to celebrate the good fortune
6. *BREATH*
7. Start arrangements to have my "dream house" built
8. Make arrangements to ensure the welfare of family & friends
9. Take a long spa vacation
10. Start researching charities and alloting funds to where *I* feel the money will most benefit.

I'd alternate between the first three for a while:

1. Breathe
2. Think
3. Study

Everything after that is wild speculation, but:

4. Set half aside in a safe, long-term investment, with funds designated to go to institutions/charities of my choice when I die.
5. Ask my parents and grandparents for a list of every damn thing they want, and buy it all.
6. Start traveling with any friends who want to join me.
7. Give a lot of money to the Freedom From Religion Foundation: http://ffrf.org/index2.php
8. Give a lot of money to the Certified Humane people to expand their program: http://www.certifiedhuman...fault.html
9. Finish putting myself through med school, focusing on global health issues, so I can practice medicine where I'm needed.
10. Buy houses where I want them, and a fun car for each driveway.