Circuitous Route: (This is how we did this in 1999.) From the Grizzly Gulch/Silver Creek TH, follow the standard Redcloud-Sunshine Route used by many 14er climbers that goes up Silver Creek and circles east and southeast to a trail that goes up the north slope of Redcloud. From the Redcloud summit, continue following easy, Class 1 climbers trail over to Sunshine Peak. From the summit of Sunshine, descend NW to a flatter area at 13,300 ft. on very tedious and loose rock, later in the season after the snow melts off. (Class 2) You'll likely find a trail to follow down to here. From the flat area, continue NW to the Sunshine-Sundog saddle at 13,100 ft. on more tundra. Continue NW ascending directly on the ridge toward the prolonged Sundog summit ridge. A rocky cliff band will force you left to find a break (Class 2+) and once above that obstacle, follow the mostly rocky ridge NNW to the high point on the western end.
To descend, drop directly north from the summit on a pronounced ridge. Not too far below the summit is another cliff band with a major interruption that allows easy access through. Continue downhill all the way to the trees on mostly scree and loose but not too difficult rock (unless ascending). Lower down, perhaps at about 11,600 feet, watch for an opportunity to drop right off the ridge (steep and rugged for a short distance) and cross the south fork of Silver Creek, pick up the trail on the other side and head on down to intersect the main Silver Creek trail that you started out on.
Alternate Shorter Route: The alternate route goes up the "descent route" from Sundog as described above. This will reduce overall mileage for the day to about 6 miles and total elevation gain is reduced to about 3,050. Gerry Roach describes this route in his "Colorado's Fourteeners" book as an alternate way to climb Sunshine Peak. See page #286, 28R5 route description.