I'd pretty much be doing what Angelina Jolie is doing. Having a baby with Brad Pitt. Really though, I would do what she's doing, globe crossing and giving money away to relief efforts. Hopefully Bill Gates does the same thing after he steps down. The world needs more people like that, and a hell of a lot less like Donald Trump.
If I was rich I'd buy a couple of good guitars and basses, plenty of music disks, a keyboard... a MUSIC STUDIO!!!