After the initial shopping spree (mostly clothes, shoes, etc) and the extended trip to WDW, I'd pay off my house, redo the kitchen, put in a inground pool and landscape the yard, buy my husband and son new jeeps, buy me a new volvo, and save the rest for vacations,college, and helping out family and friends.
ETA: More of what I would do if it were a multi-million win. Besides the above stuff, I'd open a children's bookstore (I'd have to quit my job), buy a couple of vacation homes - one in St. Joe, Michigan and the other in Malta, somewhere. I'd give a lot to charity and research.
I'd love to start a school for gifted children who are not succeeding in traditional schools, but that's beyond me. Maybe I could finance it if I found someone I trusted.