If I win tonight, I'll make a comfortable life for me and my family and buy some friends substantial presents. Over the rest of my life, I'll hopefully have a family to make comfortable and secure the future of too. I'll have nice cars and a nice house (or more) and have fun on holidays and whatnot.
Once I work out what I need to do all that, I'll work on giving the rest of it away throughout the reset of my life to generations who need it more. Not just to instant-relief charities, but I'd invest in things which will secure the futures of parts of the world's population too (water supplies, food supplies, medical research and so on). I'd also invest in education in this country.