Precisely one million? Donate to some charity so that the I.R.S. puts me into a lower tax bracket, pay off debts, buy my folks something special, and invest the rest of it.
Now if it is was 20 or 30 million...might have to get to work on my GTA clone that takes place in 1864 right on the Cumberland Gap in Tennessee. The Union forces are heading north and Tennessee has refused to take sides in the war. Bootleggers, Confederate thugs, freed slaves, and exiles from the coast. Oh the social commentary about America I'd weave...
Sorry, rant over.