Very good report, but there are a couple of note for those going to SGN the next time.
The brown water you see in the Mekong Delta is a by product of every thing that came down the river beginning in China. It is the same every where in the world where the river meets the ocean.
Where else in the world can you get through custom with suitcases full of cigarettes, liquors, and medicines for US$5/person? Be happy that they save you time for only $5. I have spent hours at US custom for bringing in nothing, yet they want to search by baggage any way. $5 is cheap for saving time and making a connection.
My next trip on SQ will be end of this July in First PHX-EWR-AMS-SIN-SGN and return. My report will not be as comprehensive, but I will have many pictures to share.