Hm, well not a lot actually. After taxes (at least in the US) it goes down to something like 600k. So i could pay off my parents mortgages, mine and pay off outstanding debts.
Get a decent apartment, a badass top of the line computer, all the books I ever wanted to read, a new car, and bring some friends along. Oh...and I would pay my debts off first...and then probably the debts of some of my friends and family.