Easy.
Pay off family debts/bills, buy some houses/cars whatever for family. I haven't got many blood relations left and while I've got plenty of 2nd n 3rd cousins I'm not gonna buy em all something. Uncle Martin I haven't seen in 30 years... yeah, not so much.
Figure that'd cost me $20 million TOPS
I would buy some property, probably something like this
http://www.vladi-private-islands.de/...terranean-sea/
Let's call that $25 million
I'd buy a nice yacht or some charter/time share rights to a jet so I could get to my island
Call that $2 million
I'd set up some sort of revenue stream for a couple of my favorite charities
I don't really know what, but I've got some money, I may as well spread it around.
$50 million
I'd gratuitously piss away a few million... cars, parties, nice clothing, gadgets... I'd solve some first world problems, like not having air conditioning in my house or the newest cell phone.
$3 million
I'd probably buy my employer's business so I have something to do when I'm bored.
$5 million maybe
I would slap the other $395 million into some sort of savings/investment scheme, even at 2% interest that should give me $7.9 million gross income... I don't know, I should be able to sustain a reasonably lavish lifestyle on that much and still make yearly charitable contributions without stretching myself too badly.