You know what else I would do if I won the lottery? Start saving up for my children's college fund. Yeah it's kinda cliche but college costs a lot of money.
Depends on your context...
If you actually have, say, a million dollars, you can pay cash for pretty much any major, and masters program, and doctorate,
including books, room and board, and in all likelihood, travel for a semester or two at some exciting foreign school, with a lot
My interpretation of "a Big Lottery" is at least in the 8-figures, and expenditures would include whatever
college expenses might be required for all the college-bound folk on the beneficiary list.
...and I'd probably start with just plopping a pile of dollars into 529 plans. That'd take care of the basics right there.