*Try to come here before 6 PM, the owner told me that sometimes they close a bit early.*
I drove by a vegetarian restaurant I hadn't yet heard of: Fuang Vegetarian restaurant. It's located inside the old city, but on a very quiet side street. I was the only customer at that time; still I decided to check it out and I was not disappointed. It's opened from 10 AM until 6 PM. The restaurant has lots of open spaces, giving it a light and airy atmosphere. Most of the seats are comfortable sofa's and cushioned chairs. The staff seemed a bit shy and couldn't speak English well, but they were very friendly.
I ordered a red dragon fruit shake, a banana flower salad and Pad Fak Thong, a simple dish containing pumpkin in a mild curry. All of it was delicious, but especially the banana flower salad. I've had a salad like this before but usually it was made with a rather tangy salad dressing. The peanut-coconut salad dressing on this one gave it a very soft and hearty taste, which I liked more. The Pad Fak Thong contained large, fresh slices of pumpkin mixed with scrambled egg, tofu, lentils and Thai basil. As it is so simple, I think this would be a great dish to make during autumn. The dragon fruit shake was good as well; a decent size, lots of fruit and just a bit of sugar.
All in all this only cost me 160 baht. There are other great vegetarian restaurants inside the Old City with good prices, but some of them are always fully packed. If you're inside the Old City and you're looking for a quiet vegetarian restaurant with good food and good prices, for a late breakfast, a lunch or an early dinner, give Fuang Vegetarian a try.
Cons: Not open until late