It would not be my first choice to visit in Bangkok as I find the temples and other attractions more important but it is a really interesting market . Apparently the largest in the world... So there are streets of just clothes, fake flowers, Chinese imports, fish, food, furniture you name it is is there and in masses. I actually expected it to be more crowded and sticky than I was of course there were loads of people but at 11 am it was fine. I would recommend an easy 3 hours strolling around.