To enhance and preserve the sacred places, we kindly urge you to observe the following rules:

Wearing revealing clothes such as shorts, tank tops, and skirts showing flesh above the knees is considered very disrespectful. Also, showing bare shoulders is not appropriate. It’s strongly recommended to dress respectfully when visiting Angkor, as it’s frequented by Buddhist monks for spiritual activities.
Monuments

Touching carvings, sitting on the fragile structures, leaning on the walls, moving or taking the archeological artifacts, and graffiti are strongly prohibited.

Backpacks, tripods, umbrellas with sharp tips and high heels are discouraged from being brought or won inside the temples.

Having loud conversations, making noises in the sacred sites, showing inappropriate behaviors or attitudes, in Cambodian culture, are considered offensive and disturb other visitors. Please, always keep calm and be respectful.

Restricted Areas
For your own safety reasons and for the preservations of Angkor, please compile with the signs on the sites and be mindful of your own steps at all times. Do not climb on the loose stones. 

As a member of the World Health Organization, Angkor Wat has been a smoke-free site since 2012. Smoking disturbs other visitors and can be the reason of bush fires. To protect the environment, please do not smoke and litter. 

Buying items, giving candies or money encourages them not to attend school, but to beg.

Monks are respected if you want to take photos of them, ask for permission first. Women should not touch nor sit/stand too close to them.