Title.
Personally, I would do multiple things differently:
1) I would make sure that all people were programmed with a strong concept of morality, so that people could clearly know if a choice they made was objectively moral or objectively immoral.
2) I would make it so that all (human) beings had overwhelming evidence and/or proof of my existence.
3) I would not allow those who do evil to succeed at all; as in, I would stop them before they could make a truely negative impact (as in, I wouldn't have allowed the Holocaust or other genocidal and homicidal movement to occur).
4) I would not allow for there to be more than one religion, and that religion would be very clearly correct.
What would you have done differently?
*I would create a Universe that was not hostile to human life. Humans would be able to travel to every planet in the Universe without any type of life support systems.
*There would be no such a thing as predator/prey animals; no animal would be forced to kill another in order in order that he might live.
*Leaches, mosquitos, ticks, and other useless pests would not exist.
*Useless weeds, and bushes would not grow naturally, but would have to grown and cultivated in order to exist, and fruits, and vegetables would grow wild thus no such a thing as starvation.
*All water including that of the sea would be useful drinkable water, no such a thing as useless salt water.