I'd give away about 20 million to friends and family.
Then keep 5 million for those awful stories where someone has had all their presents stolen just before chistmas/needs to go to the US for cancer treatment/is going to be thrown out of their old people's home, and would anonymously donate to those things.
Big donation via scholarships or something to my old schools.
Keep about 10 million for myself for a rambling wonderful house in Charleston, and boat/nice car, general living etc.
I would love it, I could do so much good and help so many people. And have a fuck off massive swanky house.