From the passenger car parking at 10,460 ft., hike along the road as it crosses to the west side of Cunningham Creek and then heads uphill and south. In a little over a half mile, you'll arrive at the 4WD parking and the end of the road which again crosses back over Cunningham Creek. A gate prevents further driving, but the vehicle track continues some distance before becoming more of a trail. Not far up from the upper trailhead parking, the creek passes through a narrow chasm of either granite or metamorphic rock and presents quite a tumultuous sight. At about 11,620 feet, will be the campsite we mention in the trailhead description. It's on the slope of a hillside that runs between the two major forks of Cunningham Creek. On this unlikely looking slope, there are some tall trees and some flat spots to pitch a tent.
The main trail to Highland Mary Lakes turns west here crossing and following the stream, then turns south again to follow the main stream that drains one of the first lakes. A few hundred yards before arriving at that first lake (12,100 ft), cut right (west) up a steeper slope and gain the south flank of a mostly tundra-covered, broad ridge that's east of the Mt. Rhoda summit (UN13,402). Follow the ridge west and contour into a basin on the south side. Stroll on up the lush basin admiring the wildflowers (if you're there at the right time) and at the head of the basin, walk to the saddle south of the Mt. Rhoda summit. From the saddle, walk on over unranked Whitehead Peak on mostly tundra, then turn west and descend the tundra ridge to the next saddle, then stroll along the manageably rocky ridge to the small, rocky little summit of UN13,109. It should only take about a half hour from the Whitehead summit to reach this lowly little summit.
Enjoy the views, especially of the Grenadier Range and either begin making your plans to climb those summits or proudly point out to your climbing companions the ones you've already done. Return by mostly the same route, but if time and weather allows, be sure and hike over to Mt. Rhoda and Mountaineer Peak and lay claim to three, 13ers for the day.