As a Zen poet once wrote: "Going deeper and deeper - still the green mountains". This could certainly have been written in Khumbu, but while the mountains are the obvious attraction, the area does offer many other sights.
fauna
The national bird, danfe a kind of pheasant, and mountain goats are common in the Khumbu area, and because the Sherpas do not kill animals or birds, people can often get very close before they take off. Musk deer and snow leopards are also natives of the Khumbu mountains, albeit more rare - keep that camera ready.