Since you are at the Sheraton Royal Orchid, you are right near a place that I had an excellent meal in March. Check out the provocatively named "Tongue Thai" Restaurant at 18-20 Charoen Krung Soi 38, (telephone 630-9918). I've only eaten there once, but it was very good and pleasant. I had a dish of pork cracklings with beans and curry (I forget the name of the dish.) Mmmm, mmmm, good.