Little Pine is the king of S facing lines in Little Cottonwood Canyon.
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It's not the longest, but it is the cleanest and consistently steepest S-facing roadside attraction in Little Cottonwood Canyon.
You can almost ski car to car without much of an approach: Park at the White Pine Trailhead, cross the street to the N and work your way to the west through the aspen trees until you hit the apron.
It's straightforward from there, just boot right up it. At 3,300 feet long it's hard to find a better line in the Wasatch when conditions are right, but it's hard to nail this line in perfect conditions.
This aspect heats up and avalanches big after storms when the sun hits it.
This can ruin the snow, but if you get it during a storm, or just after it can be sublime.