Day 1: pile it all onto my bed and fall backwards and wallow in it like a pig in mud
Day 2-eternity: repeat day 1

I'd probably buy all of my mom's and my sister's debt, Build a nice house out by a lake that i'll never step foot in because water still scares me and do like @Desolate Divine, buy some old cars and maybe a ferrari, or pagani, I'd probably invest half and live off the other half plus the interest accrued, I guess it all depends on how much I won