Buy a huge block of land, build a bunch of beautiful houses, bring all of my friends there to live, invest a billion-ish into various banks so that we can live off the interest. Use a billion or so to further research in renewable energy and adaptive construction technologies (so you can have a house that can change). Once the research is completed, I'd re-do all the houses to be self-sustaining (energy wise), use some of my extra land to have self-managed farm lands, maybe a few greenhouses, until I get to a point where my friends, family and myself can live comfortably for the rest of our lives without having a detrimental impact on the rest of society/the planet/our neighbours.
If I have enough money left over, I might try and fund some research into reversing/halting cell-decay due to age, maybe throw some money at cancer research. That way, my friends, family and myself could live forever away from most of the bullshit the world goes through (and then, with extended life, I could build my fortune until I was able to create a utopian society where all means of production are entirely self-sustainable so that humanity could grow peacefully without the need for the resources of other countries, and without the risk of destroying the planet as they do so.
If I have enough money left over, I might try and fund some research into reversing/halting cell-decay due to age, maybe throw some money at cancer research. That way, my friends, family and myself could live forever away from most of the bullshit the world goes through (and then, with extended life, I could build my fortune until I was able to create a utopian society where all means of production are entirely self-sustainable so that humanity could grow peacefully without the need for the resources of other countries, and without the risk of destroying the planet as they do so.