It honestly surprises me reading some of these responses, the ones where you kinda just fuck with people.
Cause if I were, I'm assuming OP meant it to be a god analogue and not just like a sherrif of something, things wouldn't be quite so silly.
I'd destroy everything so there could never be any competition or memory of any other reality but mine. I would create a beautiful universe with one planet without large oceans or deserts or tundra. It would be full of cities not unlike celephais.
Everything would be immortal and unable to reproduce or be ill or injured. There would be no need to eat or sleep or crap. No aging or illness, no death. No war, because resources wouldn't be important and no religions or competing ideologies. No leaders, no slaves, no exploitation. No jobs.
No sexes, no races, no hatred or abuse. Pain wouldn't exist as there would be no injury. Beings are free to change their appearance and morphology as they see fit, on a whim.
They are free to create stuff, have orgies, and generally do whatever they wanted. Yet they wouldn't get bored. They would be surrounded by beauty and have all the time in the universe to enjoy it or remake what is to be considered beautiful.
So basically like K'n-yan if they didn't end up torturing each other for the novelty of it.
More realistically I'd probably replace every human on this planet with a young attractive lesbian and they would worship me as their queen. Not as utopian perhaps but still its good to be the queen.