1. Pay off my house ($30M could buy a lot more house, but I like my neighborhood too much
)
2. Pass some $$$ along to my parents and my in-laws - maybe as a trust, as lifesaver suggested, to duck those nasty gift taxes
3. Make some improvements to my house
4. Replace my car
5. Make some donations to charity
6. Take a nice long vacation with my husband
7. Invest the rest; some will become a college fund for my hypothetical future children