I would backpack through ヨーロッパ and take a road trip through North America. I'd buy the best tickets possible for all of my お気に入り bands' shows. And then when I'm done with all of that, I'd live in a nice house with a nice car.
That's really all I want to do if I have that amount of money. Travel and see concerts. It would be amazing.
Put 75% in a savings account for your future (college fees, tuition, house mortgage, bills). Spend the rest little によって little on some things あなた want, but do not overspend. If there is one place you've wanted to go to forever I suggest planning a trip to that place.