If you were the richest person in the world, what would you do?

I would set myself and my family up first. Then I would set up projects in various areas, such as homeless hubs, reduce/eradicate famine, support and fund innovations to help the environment, give everyone access to clean water. Donate to various charities I believe in and actually use the money for its real intention etc. I would also invest some so I can continue to grow the money to help more people.