[SmG Walnut Ghost]

I'd find the nuclear launch codes for my country and just launch missiles at the rest of the world until my country is the only untouched land, then I'd construct a memorial for myself in the event that I die and live in the White House for the rest of my life. The memorial, by the way, is to let the aliens know who the sole member of the human race was and to commemorate Earth's legacy as a whole.