Adding each sucessive step:
$100,000 or less: Pay down/off mortgage
$100,000 to $500,000: Buy a new car; help my brother with his divorce
$500,000 to $1,000,000: Buy each of my nephews a new car (sensible - four door, not a luxery model) and pay their insurance on it until they are 25. They would be responsible for the deductible and any increase in insurance if they have an accident, help my brother pay down his mortgage, visit friends in far flung places, flying 1st class, help my brother pay for my nephews' education
$1,000,000 to $5,000,000: Retire and pick up a part time job doing something I'd like to do, making enough money to fund my gardening and yarn addictions, travel a little, flying 1st class, set up education funds for my friends' kids
>$5,000,000: Build my dream home, preferably on a small lake, with room for a large garden, a hen house and some goats. But I'd travel across Canada first, either driving and staying in B&B's along the way or hopping on and off the train. I would spend more time in little out of the way spots than in the cities.
And before I do any of this, I would talk to my financial advisor on how to set up investments that would pay me regular dividends but wouldn't be accessible otherwise so if my spine weakens, it is still easy to say 'No'. And at each sucessive step, I'd still donate to charity, just in increasing amounts.