When I finally got my chance to prove to the world the rules I could craft to make living much more enjoyable, I had things like "If I were in charge of the world, there'd be no fat grams, no puking, and everyone would feel loved." Ah, the things the mind of a pre-adolescent comes up with. Although I still agree to those basics. How great would it be if nobody puked? And if we didn't have to worry about fat grams? And of course, everyone should feel loved.
As an adult, I'd probably add a couple things. Like having success in life be part karma system- you can't be truly successful unless you do good things and are a good person. And everybody gets to pick one thing to be really talented at (I don't think it's fair that some people have all the talent). And that we all eventually figure it out before it's too late. And everybody everywhere gets 4 weeks vacation and 4 roundtrip tickets to anywhere (doesn't make any sense to have a giant world and no money or time to see it). And for every bad thing that happens to you the equivalent good thing happens to balance it all out. And boys are no longer stupid. And you get shocked if you use more than 3 exclamation points in one email (punctuation abuse is a crime).