Do's

Carry enough kerosene or cooking gas for all your requirements so you don’t have to use wood as fuel.
At places where toilet facilities are not available, defecate 30 m away from the water sources and bury or cover the waste. After using temporary toilets at camping sites always fill them up with mud or sand.
Respect local customs and etiquette.
While taking photographs exercise restraint, respect privacy and obtain permission.
Remove shoes while visiting temples.
Carry medicines and a First Aid Kit for use in the event of an accident. Also carry a bottle of boiled water while trekking.
Always trek at a consistent, medium pace.

Don'ts

Do not litter the mountains. Carry back all non-degradable material, and burn or bury paper before leaving your campsite.
Avoid using pollutants, such as detergents, shampoo etc in streams or springs.
Taking away of cuttings, seeds and roots is illegal in many parts of the Himalayas.
Do not make open fires and discourage others from doing so. Do not use wood as fuel for fire at camping sites.
Never touch or remove religious objects and respect holy places.
Do not wander alone in the forest.
Never leave lit cigarettes or any kind of fire burning in the forest.