That entirely depends on the amount.
If I won so much that if I lived with sense, I never had to work again, I'd do that, even if it meant I would have to work extra to be able to afford travels and such. Or maybe I could save up that money, and work normally, but instead get a early retirement at 30, 40, 50, whatever.
But before that, I have student loan, mastercard loan and a new house to buy my mom (she lives in a really crappy one now, no real bathroom or anything). My little sister and her family (fiancee and baby) are looking for a house (they'll setle for a bigger apartment right now) and could probably need a loan too. Specially since they're aiming to have another child as soon as possible.
But let's go crazy, and say I won so much that I never had to work again if I live in moderation, AND had a million or two to spend.
I would buy a house and fil it with cool stuff (a comic book library, a fake bar, etc etc)travel, live in atleast two different countries, self-publish a novel (maybe just as a Kindle book, but still), maybe start a Swedish comic book anthology or write a comic on my own, do things on my bucket list (see sites, learn to play guitar, etc etc).
So I wouldn't go crazy (unless I won a crazy amount of money) and choose a modest life.