

In order of preference:
The ability to travel through time (and change things) as I wish, and to also have a basic understanding the way those changes will impact the (relative to the time I am currently in) future. None of that “Earth’s in the wrong place, you die in the vacuum of space” bullshit.
The ability to bring people back from the dead and have them be healthy and happy
Shape shifting








“We shouldn’t be setting bones and giving people casts. Just imagine how much more reckless people will be if they don’t have the threat of deformity and lifelong pain!”
Let people have nice teeth, even if maybe they didn’t take the greatest care or them as young folks, or grew up eating highly acidic foods or drinking soda.