Here is a view of the Huc Bridge from the temple on the island. Like nearly all the temples we visited, these are active places of worship as well as tourist attractions. This lady is making a sacrifice in a small altar just outside the temple.
She has a message on a card that she soaks in a small bottle of alcoholic spirits and then burns it inside the altar. After a few prayers she leaves the empty bottle and returns back over the bridge to go on with her day. Ancestor worship is a stong component of Buddhist teachings and is strong in Vietnam even among non-Buddhists.