First, I would go donation-crazy with the causes I support. Then I would get some major recording equipment and instruments, do some stuff for my mom and my grandparents, put some in my college fund and find somewhere to live. Then if some were left, I would buy some CDs or something.
With a million dollars, I would buy many cans of food and donate them to many food shelters and soup kitchens. I would also buy clothing for the needy and make a shelter for the people on the streets in Chicago because I hate when I see poor people who are cold, hungry and begging for change. I would also try to find a solution for gas-fuelled cars, and instead make them run on water or a liquid that doesn't pollute the earth and ozone layer.