I'd probably move to Hawaii.
Probably by a Trackman. And a SAM Puttlab. And my indoor hitting 'bay' like the ones you see at PGA Tour Superstore for the rainy days. I'd pay off my parents' mortgage, let my dad choose from a selection of Corvettes to pick from (he's always wanted a 'Vette), then get my mom a fur coat. Pay for the college education for both of my neices and a cousin of mine to hopefully get his life back on track. Start a college fund in my name for junior golfers in my hometown (Syracuse). Build a junior program in my hometown that would pay for certain golfers to get better lessons and to take them to AJGA events. Build a rec center for kids from my hometown as a place they can go to after school and stay out of trouble. Go back to my alma mater (Coastal Carolina) and pump some money into their PGM program so they can 'do it right.' Spend a summer living in Manhattan, getting Yankees season tickets...always wanted to do that.
I'd actually live a somewhat modest lifestyle if I won that much. Probably a home worth no more than $1 million (which is still a lot of money, but if you take home $100 million, it ain't much). I couldn't bare the thought of somehow losing all that money and spending too much money makes me feel like a schmuck.
I have heard of people doing good things with the money (at least good, IMO). TLC has a show on some lottery winners and a few of the winners have donated a ton of the money to charities. One man pretty much donates EVERYTHING he won to some sort of charity. Pretty impressive. On a bit of a side note, some friends I grew up with, their uncle won the first ever NY state lottery. Of course, he went dead broke later on.
3JACK