We did the Yaowarat Street food Tour. We were only 5 and our tour guide Nut. She was very nice, funny and knowledgeable and we learnt a lot about the food, the street vendors, life in Thailand and a little bit about Chinatown (good mixture). The food was very good ( we never would have tried it on our own) and we enjoyed the tour very much. It was very well organized, we had no or only short time waits ( but even this is fun, since it is so bustling) and it was really packed. Chinatown at night is just a must and with this tour it is even more interesting.