Honestly, I don't think most "super-powers" could grant me happiness, which is pretty much all that matters in real life.
However, I wouldn't mind replacing my absolutely awful eyesight with 20/20 vision. I'd also like the ability to go to sleep within 5 minutes of going to bed, as insomnia is really screwing me over these days.
maybe like the ability to never age and immortality so i could figure out how it feels to like fall out of an airplane or like a cliff or something...also maybe tofeel how a bullet goes through the brain that would be cool methinks