I usually do my research first but went to this place on the recommendation of our driver. It cost us 600 THB to get in and this included a boat ride. There was one boat for hundreds of tourists that did a circuit around a grotty lake.
The food was pretty good and cheap, 50THB a dish, hardly worth it when you take into account the entrance fee though. The kids loved feeding the fish.
We paid the extra 20THB per person for the mini train ride and it didn't even do a full circuit, which my 5 year old found extremely disappointing.
Overall an expensive and awful disappointment. Not a floating market at all, just a gimmick taking your money at every turn