This is a Powerball fantasy, like when the jackpot is near $1B level. I never buy lottery tickets, so this is extremely unlikely to happen.
Pay the taxes, first. I'd probably hire a stats guy or a couple accountants to help me figure out whether to take the lump sum or the annuity since I just don't know the answer.
Once that is all sorted out, I'd spend the rest of my life working with the city at the center of the metro I live in on three fronts: angel investing in new businesses, whatever level of bribery/collusion is required to revamp the planning/building/zoning code back to pre-WW1 before it was all auto focused (no more parking minimums, no more widening streets for commuters, no more surface parking requirements), and redeveloping some of the struggling, bombed out and prairie-like neighborhoods that kill the city's reputation in streetcar suburb / urban fashion, building in the eclectic A+C styles of the early 20th century, with a good amount of Modern home styles thrown in the mix, as well as some 1890s-1910s Richarsonian, Italianate, Second Empire, QA brick and stone construction, and legit built to the sidewalk commercial corridors. Restore the street grid and the pedestrian infrastructure. See if I could make the first mile of a new link on the light rail happen. I'd rebuild some of the ponds and creeks that were filled in or covered up a hundred years ago with a trail system to match. If I made a similar living to what I currently make after all that, I'd be happy. The assumption being of course that I am selling all this construction to fund more construction, not simply relying on the principal to pay for it.