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
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.
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.
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.