Were I ever to win or otherwise come into a massive amount of cash like that, I would do the following in order:
1) Give a giant pile o money to the church. Perhaps in cash, perhaps in check. If in cash, I would enjoy seeing the world's reaction but specify that they not be told who gave the money. Only myself and the pastor I gave it to would know.
2) Pay off the family debt. A relatively small chunk of change for such a large amount of moolah.
3) Buy a house for myself. Something modest, but nice, and a comfortable size.
4) Donate. To any number of groups that can put it to good use.
5) Take care of something.
6) Get the paint and interior done on Pop's Bel Air.
7) Find and obtain one cherry '57 Thunderbird, or perhaps pay to have a not so cherry one restored to help promote the economy.
Seriously consider starting some manner of business that employ's a large number of people, or could grow to do so, and get some jobs for the American People. I'd also sell the product / service we'd produce at a reasonable price.
9) Get a few toys. Finish my Pilot, build a Starship Bridge in an outbuilding on the same property as the house, with working displays and such. Interactive. Perhaps an X-Wing Simulator.... or several. With companion TIE sims as well. I would also pursue the opening of these toys to the public, with a low admission fee to help cover repair and running costs, and so that it would be self sufficient when it all eventually left my hands.
10) Invest, a little (relatively) at a time, through various means in various things.
11) Put the remainder in a Savings Account someplace. Or several. Continue to donate as previously mentioned, live off slightly more than necessary, but still modest.
12) Probably find and buy a real Original Trilogy Prop. Because that would be so wicked sweet it would blow my mind.
13) SPACE.... I think something might be done here. Not sure what, as that's probably still not enough cash to get there and build a moon base, let alone the Enterprise, but perhaps I can send a lavalamp into low orbit or something.