Waterton lakes, Banff, jasper (the icefield highway #93 is gorgeous). And I did a road trip across Canada trip a few years back, and I fell in love with gros morne, the Lanse aux meadows, and the bay of fundy.
The geology in gros morne is spectacular, and inland fjords!e fundy tides are a force to be reckoned with!
And of course the Canadian Rockies are a beautiful backyard playground for us, I love backpacking in the shoulder seasons and staying in the huts, or even winter camping and snowshoeing. I tend to avoid the summer crowds, and definitely the long weekend/spring break crowds. I took my daughter to Yellowstone st 5 months and camped with her in September where overnight lows were around freezing... I prefer the cold to the people.
I seem to be woefully ignorant of middle Canada though... my ontarian parents would not be pleased...