Once you arrive in Lhasa, you can opt to travel by flight or train since there will be a provided assistance which will welcome you then bring you to your hotel also. There will also be a route which will take you to go sightseeing on Yarlung Tsango River which is known to be the longest and widest river in Tibet.
When you already arrived at Lhasa, better give yourself some rest plus feel free to adapt then take a stroll around and walk towards the Potala Square, a place where you will surely love to take your time while enjoying the glamorous fountain that contains a variety of colors which will surely catch your attention and will tempt you to capture amazing photos.