If you are reaching Leh by air then it is advised to remain passive for minimum two days, let your body embrace this altitude and lighter air. Drink a lot of fluids and stay off alcohol.
Once you are acclimatized you can enjoy this beautiful land and enjoy hassle free. As most of Ladakh has close proximity to line of control and border areas it would be required to get permits and permissions to visit for Foreign nationals and Indians would be required to carry valid id proof.
The permits are required for foreign nationals are required to visit ‘Inner Line’ areas like Nubra Valley, Pangong Tso Lake, Durbuk Block in Changla pass zone, Tso Moriri, Tsokar lake area and also in area along the Indus River, east of Upshi and Dha-hanu in the area along northwest of Khalatse. The permits are made available by the travel company and does not need to be acquired while applying for Indian visa.The border crossings are not open between Ladakh and neighbouring regions.
The foreign nationals can go upto the edge of Pangong Tso lake, Maan and Merak villages but not along the edge of it to Phobrang and Chushul villages.The would not be allowed to proceed upto the Indus from the Mahe Bridge. In Nubra valley they will not be allowed to go beyond Panamik
Passport, Driving license, Pan card, Aadhar card etc. will serve the purpose of Id proof. Foreign nationals however, are still required to get the permits.