To avoid much of a road walk, park at Pinkham Notch, take the Lost Pond Trail to the Wildcat Ridge Trail and climb the ridge all the way out to the summit of A Peak, then return back to the top of the gondola between D and E. Descend on ski slopes - I think the gentlest descents are to the left of the gondola and a couple of lifts. When you get to the bottom, it's only about 1.1 back to the car at Pinkham.
I've done this same route described above, which is nice. I have also done 19MB Trail, Wildcat Ridge, Polecat ski trail, ski area service road, and a road walk on Rte 16. I would not recommend that as highly because of the long road walk. However, I later learned that you can reduce your roadside mileage by using part of the Great Glen resort's Aqueduct Trail:
http://greatglentrails.com/summer/outdoor-center-2/trail-map/
Worth a try.