First I would keep my pie hole shut about coming into a massive pile of money. Then since I wouldn't have to worry about where my next meal is coming from I would start running my mouth at work and let people know what I really thing of some of their ideas. There are a couple of people who I think just like to hear their own voice and when you are in a meeting with them they give the impression that you are there to bask in their glory and genius even if they say some of the stupidest shit ever to be utter.
Apart from that get a new car (I'm thinking an M4), get a new truck like vehicle (can't take an M4 out hunting in remote areas), put up a cabin on my recreational property. Although I would like a nice custom made leather trench coat made from that nice thick cow hide that they make motorcycle safety jackets out of. Apart from that I would probably quietly give to various charities, ensure that my children will be well off, and that any of my relatives won't have to worry about school if they apply themselves.