The Highwood Pass is the highest paved pass in Canada, at 7,238 ft above sea level. And right at the top of the pass is where the Ptarmigan Cirque starts.
Despite the intimidating start, this is actually a very accessible hike, and one of the first hikes my kids actually enjoyed. Most of the 355m of elevation gain is right at the start, so it levels out pretty quickly into the alpine meadows.