One of the things you must do when visiting Thailand is to try the local cuisine. One thing that I tried that is both very traditional and super tasty was a prawn noodle soup. Noodles are very common throughout Asia and the Seafood is very popular in Thailand because it is located on the coast. Be careful though, my soup was very spicy. Bring plenty of water and make sure it is bottled since tap water is not safe to drink. Authentic dishes tend to be smaller portion sizes compared to western standardards so make sure you order enough for your group.