I read this whole thread, after imagining how I'd spend the money I have to pinch myself so I remember that I'm not actually a millionaire.
My charity would be some kind of micro-loan organisation, and something to do with the environment.
I would buy a mass amount of property, probably in the north coast of b.c.
somewhere, and start an awesome Eco-campground. No rv's, tents only. I would let foreigners come and help manage it, and I would give preference to musicians. I would spend my days at the campground, putting in work with my own hands, and playing music. I would probably travel a lot and busk in some sweet cities around the world, posing as a poor struggling musician, having the time of my life