Gokyo Valley trek adds some some extra value to the Everest Base Camp via 5 lakes of the Gokyo teritory. Gokyo is located immediately west of the Khumbu valley and is often much less traveled and developed than the main trail.
The Gokyo valley is dominated at its head by the massive Cho-Oyu (8153 meters). From Gokyo we ascend to Gokyo Ri (2 hours) for some spectacular views before retracing to Gokyo, then follow the south easterly trail to Thagnag Kharka.
The following two days are spent reaching Lobuche on the main Everest trail. Lobuche to Kalapatthar takes two more days via Everest glacier where there are spectacular high mountain views of Everest, Nuptse and Lhotse. Five more days are taken retracing to Lukla for the flight back to Kathmandu.