Kids and siblings would get a chunk. I'd put a chunk into trust for grandkids plus prepay all college expenses. Probably buy a huge LI policy in a trust to keep that much out of the federal estate tax system. Quit my job and move to a really nice place wherever I chose to live. Travel first class to a bunch of places I've always wanted to visit (Australia/New Zealand, Alps, Italy, Alaska, etc.). Make sure my kids and grandkids visited me a lot on my dime.
I wouldn't buy a 10k sq ft home or multiple homes or $350k automobile. None of those things have much meaning to me. I'd give a chunk to charity, also (almost forgot that). Take a bunch of tennis lessons and probably guitar and piano lessons, too. I think I'd be the Gajillionaire Next Door. Probably not a lot of things that scream 'MONEY' - just not my style. Would enjoy the hell out of life and make sure those I love could do so, also.