the chao river is absolutely beautiful. you can see many of the major attractions of bangkok from it. Theres a laid back shopping mall where the ferry ports are, that allows for some incredible photos. you can also see great views of many different temples and churches, along with the sky rises of downtown area. if you would like the full experience, you can also hop on one of the many ferrys that will take you all up and down the river. If your looking for a place to cool off, going to chao phaya river is the perfect activity.