I figure the government, my partner, will take half leaving me with 250 million. I'd invest that in some low risk 2-3% return bank. Interest would be 5-7.5 million per year, of which my silent worthless no good rotten partner will probably demand half leaving me with 2.5-3.5 million per year to figure out what to do with.
I'd set up multiple trust funds benefiting my favorite charities.
I'd buy a big piece of land to farm, ranch and hunt. And a huge building to house all my existing and future toys. State of the art shop to do my own repairs and restorations. I'd hire several hands to do all the crap I don't like to do.
If money can't buy happiness I'd like to try the kind of misery it brings!