I would take the USA, and turn it into the American Empire. Then I'd launch a campaign to take over the rest of the world. A central government with a power that cannot be compared to uphold the law is what I dream of.
I'd probably just overpower Kevin Rudd next time I was in Canberra and take over my lovely home country of Australia. I could take him he's a bigger nerd then anyone else in the country. Then I would start a war with New Zealand to make them our sidekick forever. But then what? I wouldn't know what to do with absolute power decide the fun personal stuff that comes with the corruption aspect of said power.
I would rule the US, take over the world, and rename the "nation" Celestial Pangaea. Then I would develop technology to colonize all the planets and even orbit the sun and travel to other galaxies (Kind of like Star Trek.).
"All we have to decide is what to do with the time that is given to us."