Why should you go there and how do you do it right?

Come here for the silk. The upper floors are lined with shops selling Thai formal wear and evening dresses, primarily catering to women. The quality is far superior to tourist merchandise. Jewelry shops are also plentiful. The ground floor offers another reason to visit: a food court with a wide selection of Thai snacks and sweets, a small supermarket, and an upstairs food court with some halal options. The snacks are reasonably priced.

What you shouldn't expect here is a spectacular experience. The fountain people talk about is more of a small pond, and anyone expecting the dimensions of a modern Bangkok shopping mall will be disappointed after about ten minutes. But that's precisely what makes it so special. It's quiet, clean, and relaxing, and the air conditioning is pleasantly cool, making it a truly useful place to cool off in the old city. I would combine it with a visit to the flower market at Pak Khlong Talat, which is just a short walk away, and use it as a relaxing break.