I went there today. Food stall P22 is the only vegetarian Food stall i could see. most dishes 45-50 Baht. you Need to buy a coupon ("credit Card" and then put Money on it) first.
There are several things to choose from. I went for "noodles with red Curry" which cost 40 Baht. I got a plate with these thin, white, cheap noodles plus some reddish looking liquid which was supposed to be the Curry. was quite spicy. tasted okay but nothing special at all.
other dishes they had looked way more appealing. the noodles were not that filling either.
there are free spices/chilli and cucumbers for you.
Updated from previous review on Saturday January 23, 2016
Cons: nothing special