There is a daily brunch, that I think is much more interesting and really good.
It is part of the Oriental, but you need to take the Oriental ferry across the river (5) minutues to the restaurant.
When you enter, they take your shoes off for you and then you sit in something like a pit, so the table is at chest level.
It is the traditional royal thai way, which gives you a back support pillow.
The serves is tops and so is the food.