I'd seek some financial advice about the best way I think. I believe large charity donations bring their own wierd costs and implications. I'd want to make sure people get the money I want them to have. If that would mean given them a gift rather than actual funds then so be it.

I really don't know where I'd start with it all. I would imagine you spend the first month of recieving a sum of money like that just trying to get your financies all structured and working best for you. I'd certainly like to find out I think.