Sure, here's an ideal itinerary for 6 days in Ladakh:

Day 1: Arrival in Leh

• Arrive in Leh and check into your hotel
• Spend the day acclimatizing to the high altitude and exploring the city
• Visit the Leh Palace, Shanti Stupa, and Leh Market

Day 2: Leh to Nubra Valley

• Drive to Nubra Valley via Khardung La, the highest motorable pass in the world
• Visit the Diskit Monastery and the sand dunes of Hunder
• Stay overnight in a traditional Ladakhi homestay or camp in the valley

Day 3: Nubra Valley to Pangong Tso

• Drive to Pangong Tso, a stunning high-altitude lake that stretches across the India-China border
• Spend the day exploring the lake and its surroundings
• Stay overnight in a campsite near the lake

Day 4: Pangong Tso to Leh

• Drive back to Leh, stopping at the Thiksey Monastery and Shey Palace on the way
• Spend the evening exploring Leh and trying local Ladakhi cuisine

Day 5: Leh to Lamayuru

• Drive to Lamayuru, one of the oldest and most beautiful monasteries in Ladakh
• Visit the monastery and hike to the nearby Moonland rock formations
• Stay overnight in a guesthouse or homestay in Lamayuru

Day 6: Lamayuru to Leh

• Drive back to Leh, stopping at the Alchi Monastery and Basgo Palace on the way
• Spend the evening shopping for souvenirs and enjoying a farewell dinner in Leh

This itinerary covers some of the most popular destinations in Ladakh and allows for plenty of time to acclimatize to the high altitude. Of course, there are many other places to visit in Ladakh, so feel free to customize the itinerary to your interests and preferences.