After the walk we drove towards Chachoengsao trying to follow the klong but it does get a bit complicated as it splits, rejoins and changes name before it reaches the Ban Pakong River. I think we were getting lost when we found a new temple building under construction at Wat Prong Arkard (this spelling is probably wrong but comes off a ThinkNet map). The size of the building is massive and the construction techniques are similar to building a shopping mall but the design is all traditional Thai temple building. I have no idea of the cost but it's many millions of Baht.
From there we drove into Chachoengsao and stopped off at the old city fort walls by the river. Had a closer look at the old cannon there and took some pictures of the marks on them. The date below is interesting. This fort dates back to the early 19th. Century and the interesting bit in Wikipedia is of it being used in the mid 19th. Century during the Angyee Rebellion. This is something I know nothing about. I have found a reference to fighting Chinese opium dealers in Chachoengsao and another to a Chinese coolie revolt in Phuket. I will try to find out more.