"Loi Krathong is one of the best-preserved traditions and most beautiful festivals celebrated in Thailand, illustrating the close relationship between the Thai way of life and water.
On the night of the full moon of the 12th lunar month (usually in November), visitors can see Thai people gather at lakes, rivers, canals, and/or other waterways to set adrift krathongs, lotus-like shaped floats made of banana leaves containing a candle, incense sticks, flowers, and coins. Nowadays, the krathongs may be made from other environmentally-friendly materials; such as, bread.
The krathongs are launched to pay respect to the goddess of water in gratitude for providing water to the people, as well as an appeal for forgiveness for polluting the water. It is believed that krathongs that float on the water carry happiness and prosperity, as well as taking away misery.
Visitors can celebrate Loi Krathong Festival nationwide such as in Bangkok, Phra Nakhon Si Ayutthaya, Samut Songkhram, Sukhothai, Suphan Buri, Tak, and Chiang Mai. "