i'd put all my money into scientific research and technological developement, make the world a nicer, easier place, maybe a few space cannons along the way, and ships, and..... *begins drooling* quantum research.... ill stop myself there, someone pass me a towel.
It' kind of that project venus thing but with a more broad approach to technology
I'd invent the best PC ever that has 10000000000009999024823904723 gazateravamizilio-bytes avaible for ram, and for space, 3 times that, a PC that doesn't hurt eyes, then invent a cloning machine and clone that computer so that everyone in the world has one and make all things in the world free, if you want one, clone it, then set up my computer and play the best games ever.
i will buy that 40% of moon that we dont see, build a super-dupersuper-duper-computer with (i hope) 3EHz (EHz=1 000 000 000GHz) and at least 1Eb RAM, And.... CALCULATE PI to 1 000 000 000 000 000 000th number