Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Kanchanaburi (74% of total searches to River Kwai). The next most popular destinations are Sai Yok (16%) and Ban Kaeng Raboet (11%).
KAYAK users have found double rooms in River Kwai for as cheap as C$ 9 (Kanchanaburi) in the last 3 days. The average price is C$ 84.