Erawan Waterfall: We recommend the service as we offered before (visit Erawan Waterfall on the day transfer to Hua Hin: 18 Feb’15) because if they want to visit during their stay at Kanchanaburi, there will have the additional service for guide fee + room for guide.
However, we have another option for your consideration that hotel (Dheva Mantra Resort & Spa) can provide this service for them but the service with English speaking guide only.