Two words... Iron Man. :buttrock:
I'd probably buy every single tokusatsu prop and costume in existence, and buy a warehouse to house it all.
Then I'd buy a blue Lambourghini Diablo, and perhaps invest in real estate or something. It must be nice being able to wave around briefcases full of cash and buying things left and right, although it must get old after a while. I'm sure even rich people get bored with themselves, after the initial wealth buzz has worn off.