Day 1: Reach Ladakh, acclimatize
Day 2: Do local sightseeing in Leh, visit places like Santi Stupa, Leh palace, Hall of fame, Leh market.
Day 3: Go on a day trip to Nubra valley
Day 4: Visit Pangong tso lake and camp under the stars in Pangong
Day 5 : Return Leh You may need more than 1 day to acclimatize , so plan accordingly.
If you hvae more days to spare, do white water raffting at Zanskar River and experience the magnetic hills
This can also depend on the season that you are traveling. The regular itinerary includes visiting Pangong lake (1 day trip), Leh-Kargil highway -->Hall of fame, Magnetic hill, gurdwara pathar sahib,Confluence zanskar and indus rivers(1 day), Leh- Nubra (Khardung la, Nubra valley hunder, panamik , diskit (2 days). The city as well- has a lot to offer. You can check out if there are any festivals that are due - during your stay. you can experience the local culture as well. Leh palace, the monasteries, Shanti stupa, Leh market, a walk from the market to the DC office, bread and kehwa gallis. In winters, you can spend time iceskating at various points in Leh.