Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Kanchanaburi (92% of total searches to River Kwai). The next most popular destinations are Sai Yok (3%) and Ban Lum Sum (3%). Searches for hotels in Si Sawat (3%) are also popular.
KAYAK users have found double rooms in River Kwai for as cheap as RM 52 (Kanchanaburi) in the last 3 days. The average price is RM 261.