Today you will visit some of the historical and cultural landmarks of the city. You will visit Boudhanath stupa in the morning. The stupa was heavily damaged by the major earthquake of 2015 but the reconstruction is completed and it is open to tourist. It is one of the largest stupas in the world. The all-seeing red, white and blue eyes of Buddha are painted on all four sides of the stupa, similar to Swayambhunath, and surrounded by hundreds of fluttering prayer flags, prayer wheels and small images of Buddha.
During the day, you will have a tour to Patan Durbar Square. While in Patan, you will explore the shrines, temples and ancient Newari architecture. The square is full of ancient palaces, temples, and shrines noted for their exquisite carvings. One can rummage for treasures and souvenirs in the various shops around the square. The main attractions of the Patan Durbar Square are the ancient Royal palace itself.
You will also visit the house of Kumari, the living goddess, who manifests herself in the body of a virgin girl.
In the evening you can stroll in the alleys of Thamel and buy some stuff you will need during the trek if you have missed while packing.