Yes you can travel Ladakh without any prior bookings if you are not choosy about hotels, Ladakh is all safe for even solo travelers.
For 7 Days Trip you can follow the stranded itinerary:
Day 2: Go till Alchi on Leh-Srinagar Highway visiting Gurdwara pathar sahib, hall of fame, magnetic hill, lamayuru, Zanskar confluence, alchi and back to leh.
Day 3: Leh to Nubra visiting KhardungLa, Hundar, Panamik, etc and stay in Nubra
Day 4: Nubra to Pangong via Shyok (July-Aug. this rout may close)
Day 5: Pangong to Leh visiting Thiksey Monastery, Shey Palace
Day 6: today you can go & back to Tso Moriri but may very hectic (this day will be only available if on day 4 you go direct Pangong)
Day 7: you can fly back or can make it a free day
Have a safe Journey
Greetings from DiscoverNH
Thanks for your detailed and prompt reply.
Just would like to share that I have travelled to all these places few years back.My question was regarding some suggestive itinerary covering all the main monasteries and sightseeing in Zanskar and Pangong and Tso moriri.If anybody can give me some inputs regarding accommodation/local contacts for transport etc. that would be very helpful.Thinking of flying to Leh and then do the lakes and then Zanskar valley and back to Leh to fly out.Hope that works.