The highest of the 3 Passes, Kongma La makes for the best all around trail and views.

Doing Kongma La from Chukhung as the start of your down valley journey to Namche will drain the tank a bit before a mostly downhill, but long, exit. However, doing Kongma La as part of your return down the valley isn’t the only way to do it. It can also be done as an out and back from Chukhung 12km with 780m gain, or as a loop starting and ending in Chukhung at only 21km with 1250 meters gain.