We are thinking of booking a tour from Bangkok to Kanchanaburi . It's a 2 day tour. First day includes drive from Bangkok ,War Museum Bridge .War cemetry and ride on death railway. Lunch . Hellfire Pass and stop at Sai Yok waterfall return to overnight accommodation. Next day is elephant camp/ride and return to Bangkok by 4pm. I feel we will be rushing through all the historical sites on the first day and not sure we really need to do the elephants as we will be taking the train to Chiang Mai as well. Any views on better itinerary?