We are keen to take the weekend tourist train out Kanchanaburi. I'm hoping to buy the tickets only 3-4 days before departure 21/7/14, is that enough time? I also see people mentioning sit on the left side, the YouTube clip of the viaduct I saw the river was on the right. Going by the itinerary there is almost a 3 hour stop at the waterfall, is there enough to do there to not get bored? any shops or restaurants. Can anyone that has done this trip share there experience?