Huh, I am actually a little surprised this didn't existed.
So let's say that you traveled across the entire universe for the Space Stone, you fought an army of zombie for the Soul Stone, you played a game of chess with a fusion of Thomas Edison, Albert Einstein and Nikola Tesla for the Mind Stone, and you did it! You survive! You now have all the six Infinity Stones and the Infinity Gauntlet. You are now the most powerful being that ever lived.
What would you do?
Personally, I would grow bigger than the entire Sun, I would turn on every single volcano on Earth, and then I will smash it in a supreme Hulk-smash move and then I would use the Time Stone to make everything normal again.
Then I would use the Reality Stone/ Juice to completely redraw the borders of the world. Small countries would became bigger, big countries would became smaller, new countries will appear and old countries shall disappear.
Then I would go to my hometown, and I would change everything and everyone. I would live a regular life, however I would always have the Infinity Gauntlet at me. If somebody laughs of me boom! dead. If I take a small grade boom! big grade. If Aliens invade the Earth boom! no aliens.
I would also make my own pocket dimension where everything I want turns real. It would also be a neverending party. The door to this pocket dimension would be in a random tree, and everybody is allowed to come in as long they are worshiping me.
Anyway, what would you do?