I think I would go crazy with too many possessions to look after and too many things on my plate, but of course I would "splurge" some at first.
I've never really thought about it real specifically...
But off the top of my head...
Muscle car of some kind.
Take care of the family and close friends and anyone else I felt really deserved it. I'd have to think about how and for whom I wanted to do this.
Invest a bunch no doubt. Live very, very easily off the interest.
I hate extreme excess so I wouldn't want to flaunt or abuse the wealth. I'd do all I could to manage all the attention and maintain some normality.
Do all I could to not be seen by people as just some "rich bastard." One more reason to share it...
Make some donations to key charities and causes and also figure out some other ways to worthwhile spend it.
Spend money to support and empower anyone who I thought truly knew things and had special things to share. Knowledgeable people in key areas.
I'd help out my home course probably.
Go get my septum de-deviated. (for real)
I would spend a lot of time golfing and for something to do and to be around people I would still probably want to do some golf teaching...
Travel, no doubt. NO, LA here I come. Play Pebble, St. Andrews, etc. etc. etc. blah blah blah eventually.
Throw Faberge eggs at someone's house. (they would have to be a rascal)
Butt implants.
(just joking my butt's fine)