1. A Space Travel. Would pay Roskosmos or NASA for a travel. 2. Build a whole new industry - Flying cars. I know, I know it's very complex story, but I would invest a billion on this! 3. Build a competitor to SpaceX and make it even better. 4. Find a Foundation to help people those need help, like Bill Gates does. 5. There are more... but for now I'll keep them for myself.