Reply #10: I would

[drmeow]

1) Pay off my house and the houses of all my family members
2) Try to find a way to save/invest enough where I could quit my job (with the economy where it is these days, I'm not sure what would be the best method and how much to save)
3) Do everything I can to make my house eco-friendly
4) Try to buy a local media source (radio/newspaper/TV) and give it a REAL liberal bias
5) Buy up as much undeveloped land on as many continents as I can and try to lock it down as tightly as I can to prevent it from every being developed (especially wetlands, threatened habitats, etc)
6) Donate to a/some charities that are working towards eco-friendly ways to empower the powerless and promote peace, self-sufficiency, independence from organizations like the World Bank, etc.

Edited to say

7) Add some of what greyhound1966 wants to do.