I'd just send all the stupid and evil people to hell at once (hey, I'm God after all).
That would leave only intelligent and good people on the planet. These people would be intelligent enough to raise their children to be good and intelligent. With today's technology and awareness, that shouldn't be a very hard task for them and it would become a perpetum mobile of goodwill and intelligence, as each good and intelligent generation raised a new good and intelligent generation.
As I firmly believe evil comes from bad upbringing (evil, unintelligent or both) I'm pretty sure that's what any caring God would do.
Post edited April 14, 2012 by dandi8