To all these people sayin they'd but multiple houses..

I think you're fuckin nuts.

I'd be my house, make sure my parents were covered and my brother/sister. I'd by myself a car or two.
I'd pay off their debts
I'd invest 50million. Play w/stocks with 10 million.
I'd calculate how much less I'd pay in taxes per charitable contribution by doing my taxes way early.
Build top of the line pc.
Little things.