Grizzly Gulch is an awesome backcountry ski area at the top of Little Cottonwood Canyon with a wide variety of skiable terrain.
To get to the Grizzly Gulch trailhead, drive up Little Cottonwood until you reach Alta Ski Resort. Keep left along the road and park in the upper Alta parking lot. Head up the cat track with all the cats and snowmobiles parked to the side. About 100 yards up, you'll take a left and head up the steep cat track. Follow this until you reach the part that wraps left around the mountain. You can follow this track all the way into Grizzly Gulch. Once in the gulch, you have a wide variety of choices. The big wide open area to the right is Patsy Marley and to the left is Black Bess and Michigan Bowl. From this point you can really choose wherever you want to ski. Careful of the terrain trap at the bottom of the gulch, avalanches occur in there frequently and people have been buried.
Make sure to check to avalanche forecast for the day before you ever travel in the backcountry. Know before you go!