I’m partial to US parks as well, having visited many of them across the country. But Canada has some truly amazing parks like Banff or places like Lake Louise that are world beating.
My personal favourite is strathcona park on Vancouver Island. My family spends summers and winters there. The geology is incredible, and you can find heaps of fossils in some areas. The lakes are stunning and cool throughout summer. The alpine areas are breathtaking. You really couldn’t see it all in a lifetime. I can’t think of a better thing to have a few hours away.