From the main road, I like to go to the left side of the market, and then go through the market to the canal-side, and there are some bamboo picnic tables, kind of in a food court seating area, which is one of my favorite areas to sit.
The tables are first-come-first-serve, and if you grab a table, you can then start buying food from all the different stalls, and bringing everything back to your table to start eating.