You will have two full days to explore sites of ancient Lhasa such as the Potala, home of the Dali Lamas, Drepung, once the world's largest monastery, Sera, once hosting a huge monastic population and five colleges of instruction, Jokhang, the most revered religious structure in Tibet, and the Summer Palace subject to their being open to the public. A Tibetan or Chinese guide will accompany the group. Gyantse lies beside the Nyan Chu River and is Tibet's fourth largest town, but has retained its Tibetan character. Visit Tashilhunpo Monastery, home of the controversial Panchen Lama, and the local market in the afternoon. Lodging at Xegar is spartan and the food is poor, but this is a welcome break in a long drive.
Porters are available if required.
Upon your return to Kathmandu, you will have the rest of the day to explore on your own.