Things I want to do:
Build a spaceship simulator that takes into account every physical factor effecting the ship. The pressure in the coolant pipes, the heat of the engines, the resistance of the wires, the wear on the bolts, all of it.
Create a virtual world that draws people in to play a game, but keeps them around to experience the world breathing and changing around them. To have a chance to see their own lives mirrored darkly in the world, and walk away with real emotions, honestly edified by the experience.
To allow others a brief glimpse of the world I see all day, every day.
Because it would be beautiful.