I'm not talking about traveling or buying all the video games you want to play. I mean after that, what would you do with your life? Would you still work? Would you still study? Or would you do something else?
All the time and money, huh? I'd buy a big piece of land out in the mountains, somewhere near a lake, and build myself a nice little cabin to live in. Then I'd get a cow for milk, a few chickens for eggs, and a few dogs for company. Then, I'd build the biggest, coolest, most hi-tech garage/machine shop/wood shop/laboratory you've ever fricking seen, and I'd spend my days building stuff, when I'm not out hunting or fishing.
If I had all the time and money in the world, huh? Hmmm... Well, if the people who lost the money were real poor, then I guess I'd give it back to them. (Thank you, Yogi Berra.) But in all seriousness, I'm not entirely sure. I'd always dreamed of making my own 2D platformers, so I guess I'd start learning how to properly program stuff and churn those out. Or maybe I'd hire someone to catch feral cats and have them spayed/neutered and treated for diseases on my own cash.
I would definitely not stop working, I would use the money to build a gigantic place for bands to practice including a public recording studio. That would keep me occupied for a really long time, but it would be worth it.