Bangkok means traffic jam so sometimes it is easier to use the river
the best way is the Chao Phraya river express boat with an orange flag
If you have time and you are tourist , you may want to take a long tail boat , they will drive you around the khlongs
From the boat ,you will enjoy sightseeings as buildings and bridges
some buddhist temples
some local life
kids bathing in the Chao Phraya
On the Chao Phraya it will be a peaceful day ...