I suppose I'll limit myself to something less-than god-like. Otherwise I would pick time manipulation or immortality.

If I could have one superpower it would be invisibility. If I could turn invisible I could do so much. I could go any place I want. I could do anything I want. I would not do bad things with my power. Like I would not hurt people or anything, but maybe I would take food or money that people didn't need. I could even help people in trouble. If I saw a man running with a lady's purse I could trip him. My older brother wants to turn invisible too. I heard him say that to his friend one time. He said it would make him better at being friends with girls. I guess it would make me look pretty cool.