If I could have one superpower it would be the ability to fly. I would love to see the world from a birds-eye view. Also, it would be a lot easier to go from place to place if you could fly instead of having to walk or drive around the obstacles in the way of a straight path from point A to point B.
I also feel like flying would be a good superpower for me to get over my fear of heights, which is really only the fear of falling from a high place. I would be able to see how things look from a high spot without having the fear that I could fall from that high spot.