I would buy myself a few politicians,
a Bugatti with all the diamond accents,
a Bently Mulsanne with the 120000 usd package,
a nation preferably in the bahammas,
a house that is bigger than a mall,
and finally I would buy myself Koch Industries to show my home city of how rich I am.
Edit: I would donate a trillion or so to a few Universities with a focus on MIT and CalTech.
ReEdit: I would also buy Comcast and force my Net Neutrality on people, I would also make a new fiber optic network that has that ultra fast 43tbps stuff on the ends.