Nice temples, a several old markets and floating markets. A small city which you could spend one day trips or take a few nights near Bangprakong river.
Chachoensao, is a large country town, not a tourist town - you will definetely need transport to get around, so tuk tuk's , taxis or a car is a must
In the city of Chachoengsao province, travelling by two row seat bus start from early in the morning to 6pm-7pm approximately.
the area close to the river bank is beautiful. The city is also have the old popular temple "Sothorn Temple" (Wat Sothorn Wararam) and old local markets.