Pay off my debt then buy myself a big truck and go on an epic road trip, after spoiling my grandkids.
I would do a lot of frivolous things, I think. I would probably go on vacation and buy a car, get a really nice house and deck it out ...
Share it with my family.
I would definitely enjoy the rest of my life. Do things I've always wanted to do, goals and stuff.
I would split it up with my family.