Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Kanchanaburi (75% of total searches to River Kwai). The next most popular destinations are Sai Yok (20%) and Ban Kaeng Raboet (3%). Searches for hotels in Ban Kaeng Raboet (2%) are also popular.
KAYAK users have found double rooms in River Kwai for as cheap as $16 (Ban Kao) in the last 3 days. The average price is $48.