What I would do if I win the lottery (I have given it a lot of thought btw):
Take care of my family. My Sister, Brother, and Mother will all receive substantial amount of money from me that they never have to work again.
Buy a new house, maybe one that I build myself. Must have a nice study room with space enough for me to display my collection.
If my marriage is going to end I will just split the winning with my wife and say adios to her first before buying anything for myself. Even if it's not I may just part way with her so we won't argue about how to spend the money.
Start a business, web-based, that will allow me to go to many events. Have press credentials that can give me passes to red carpet events like Oscar and Sundance festival so I can see celebs in person, as well as major video game conventions like E3 and Tokyo Game Convention. I'll be spending a lot of time traveling from one event to another and writing blogs for my web audience for rest of my life and loving every minute of it. I will also attend many sports games of my favorite teams like Lakers, Mets, and 49ers, probably buy season tickets for all of them.
Spoil my son silly. He already has lots of toys but I'll make sure he's happy and healthy for rest of his life. But if he turns out to be a spoiled brat then he'll get a spanking from me and no inheritance money.
Hire a personal trainer who'll help me get the kind of body I've been dreaming about. I will to look rich AND ripped.
Last but not least I will be a major contributor to my High School football team because I want them to succeed year after year and never lose to the cross town rival ever again.