Rebuild the two schools where I've worked for the last 2+ decades for starters. Then I'd start criss-crossing the country and find other neglected schools, and work on them. Education first.
As mentioned earlier, great post.
While such an income would allow for personal financial security (and some small indulgences, such as a small - relatively speaking - Georgian town house - I spent the first three years of my life in such a place - my parents rented a flat at the top floor of a city centre Georgian house and it imprinted on me that way balloons are said to imprint on baby ducks deprived of their parents), and ensuring the security of my family, plus travel, there are other things I would wish to fund and finance.
This - education, especially facilitating educational opportunities for girls - would be one of my major concerns and priorities, as well, should such fortune come my way.
I've worked in some of the most troubled spots on the planet and have seen, first hand, what some of these cultures and societies are like.
Therefore, I would seek to find ways to educate girls and women, and empower women and support children in such environments, through the provision of education, and health programmes, and support of programmes which encourage the economic independence of women, and which support (through financing) access to safe, affordable and reliable birth control.