Flying’s first. Flying is always going to be first.
Breathing underwater… but I wouldn’t want gills. So maybe just ability to hold breath for hours at a time?
Echolocation! I want to know what that’s like. And I want to be able to walk around without the lights on. I can see pretty well in the dark already, but still.
Wider visible spectrum of light… Infra red, ultra violet, etc.
Ability to sense the earth’s magnetic directions. I’m usually pretty good about orientation, but if, for example, someone else drives me somewhere, I’m lost.
Better sense of smell, enough to distinguish all the different components.
Changing skin color would be pretty cool, too, as long as I could control it.
Behavioral, I want to be less self conscious. I don’t mean in an insecure way, I mean being overly conscious of myself rather than just existing. I have a practiced censor, always deciding whether I should react, whether I should speak, whether I should do something, etc. There’s an ease and an honesty and a liberty to just being.