I've thought about this before:
I'd use my omnipotence to create an identical universe for me to inhabit. I'd basically copy-paste our current one into it. I'd change the date to my birthday, in '93. Then I'd take the place of myself-baby and, finally, erase my memory on a controlled time lapse basis- so, in X years, I'll begin to rediscover my powers, and then, as an adult, I'll finally remember my godhood. That way, I could do all of the cool "Oh, snap! I have superpowers!" stuff as a teenager, then move on when I grow up.
Oh, I'd probably make myself a girl, too. I am sick of being a guy, and, for that matter, people asking why I'm playing as a female character.
EDIT: Hm. Quite a depressing idea, actually- a god, driven mad by his loneliness, relives his mortal life over and over again, for eternity.