Someone revived an old thread. Oh well, it looks like a fun one.
Man, I'd want to do a lot… I'll impose my own rule that I can only solve problems in a way I can conceive (not just snap my fingers and say "no more disease and stupidity!)
First, the Earth problems:
-Create vaccines to AIDS and many other diseases, as well as antibiotics for resistant TB and others (but make them hard to produce so we don't overdo it like with all our other anti-biotics. In fact, I'm going to stop the overuse of antibiotics altogether.
-Improve biology to the point where we can make new compatible organs and limbs in labs and safely introduce them. New heart, no problem!
-Turn the Sahara and Gobi deserts into verdant grasslands, fit for agriculture. Complete with rivers, tributaries, and adequate rainfall. That should help feed the hungry masses.
-Lower fertility rates in the 3rd world. This seems the easiest way to fix population imbalances. Birthrates stabilize at our current population, helping to prevent starving in Africa.
-Big one: Cure aging. This stabilizes populations in the 1st world, where birthrates are already low. Plus, who wants to get old? Just take your anti-aging medicine. It would be cheap, available, and if you don't like it, just don't take it and get old the way God intended (then again, I'm God, and I intend you to take it, heh). This solves short life spans, and allows people who want to die naturally a way out.
-Lower CO2 and other pollutants down to pre-industrial levels, stabilizing man's BS for a little while longer.
-While I'm at reversing our own destruction, I'm returning the Amazon, Congo, Borneo, and other rainforests back to their cover a century or two ago, and bringing back some extinct species: like Auks, Dodos, pygmy mammoths, and the ones we killed off lately. At least the ones I like and can think of in one day.
-Finally, I'm building a space elevator out of stupidly expensive carbon nanotubes or whatever else it needs to be made out of. No, three space elevators! One in Ecuador, one in Kenya, and one in Sumatra. That gives everyone relatively easy access.
-Lastly, give myself a nest-egg so that I never have to work again. Hurray!
Then, as for outer space:
-Venus, Mars, and Ganymede become human habitable. I'm also lumping the asteroid belt into a 5th inner planet (Would Jupiter just rip it up again? Purple, you know?), also Earth habitable. Insert appropriate greenhouse gases and gravity/density here! Eventually, we'll be able to live on a bunch of different worlds.
-Create a loophole in physics enabling some kind of FTL travel. Like Star Trek warp, although I like Larry Niven's basic concept better. Make it so that humanity actually knows about the loophole.
-Create lots of human-habitable planets around nearby Yellow/Orange/Red stars, so that when we finally make it out there, we've got places to go.
-On one of those worlds, say around Tau Ceti, plant alien life! Not necessarily intelligent, but multi-cellular. Just fast forward evolution a bit (I can do that in a day, right? By "24 hours" I'm going by what I as a mortal can conceive of with my Godly powers in that time)
-Make it so that Andromeda does not collide with the Milky Way in a bajillion years. I've heard it could conceivably be bad.
-I want to change the "end of the universe" from spinning out into oblivion to something more permanent… but I can't figure out how. Damn, guess my 24 hours are up.
There, I think I've done a good job as God improving the world and the universe without mucking up the free will of people to be bastards and all that. Good job, Me-God! It was terribly tempting to kill off organized religion. And to fundamentally alter Republican party, the US constitution, make China/Russia/Arabia/Africa liberal democracies, and SO MUCH else. But, I don't think that's appropriate to mess with, is it?
(Hm, also didn't do something tickle related. I'd find the time for that, but since this is in the general threads, I'll leave that to everyone's imagination)