We often take guests into Tibetan areas, staying sometimes with Tibetan families.
For many, its a highlight of their trip.
There are a few pointers:
don't point with your fingers at anything;
don't take photos of religious shrines
don't take photos of people without first asking
go clockwise around the monastery or temple;
take off your hat and sunglasses before entering;
don't make a lot of noise, or take photos of objects or people without permission