HUGE interview next week, need advice?

I have an interview with a billionaire businessman next week. I am not applying for a specific job. I secured a meeting with him because I am close with one of his closest friends. The problem I am encountering is I am in my late 20's and I have no idea what i want to do for the rest of my life. I am not Awesome at any ONE thing, i am just pretty good at A LOT of different things. I am interested in a bunch of different industry's.. real estate, hospitality, charity's, developing, marketing, finance and big business in general. When he asks me "what do you want to do?" I DO NOT want to say "I don't know". Any advice would be mucho appreciated. Thanks!