i'd keep to the natural world when human beings were not the dominant species of the world.
and then i would stay there.
and if i ever died, i'd just go back and un-die.
Live in pure bliss as one with nature.
oh, so you'd enjoy being buttfucked by dinosaurs and flying assholes with the ability to swoop up an entire car without cringing? i'm sorry, there was never any "bliss and harmony". nature was even more chaotic before we humans "suppressed" it. animals would not accept you, every species would chase you away from their turf.
i would: give hitler a hug, correct things i regret doing/not doing, and abuse the shit out of it.
alternatively, what deejay said.