Make sure to add these to your list:
War Remnants Museum: Interesting to see, but the exhibits were very one-sided against the US war.
Ben Thanh Market: This is a huge French-built municipal indoor market where you can buy vegetables, meats, sweets, spices, household items, clothing and everything in between. There was a lovely Taoist Pagoda near the market.
Rooftop Garden (formerly The Rex Bar): This is the famous rooftop bar at the Rex Hotel where during the Vietnam War, expats and wartime journalists came to drink and exchange stories. It is listed along with the Ben Thanh Market in the 1000 Places to See Before You Die book!
I visited several galleries including the well-known Apricot Gallery which I had seen also in Hanoi. I really like contemporary Vietnamese art and found two large lacquer paintings by Bui Huu Hung which I purchased and had shipped to Chicago.
I also shopped for lacquerware in Saigon at Tay San, a huge factory/showroom, at 998 Vo Thi Sau Street. They had a wonderful selection at good prices. I think you will find that lacquerware is one of the best thing to buy in Vietnam
I also shopped at 27-7 Handicraft Company, at 153 Xo Viet Nghe Tinh, which helps create jobs for handicapped people.
If you missed Khaisilk in Hanoi, they do have locations in Ho Chi Minh City. The headquarters is at 107 Dong Khoi Street. They also have several wonderful restaurants, Cham Charm, Au Manoir de Khai, Nam Phan, TaoLi, Ming Dynasty and That’s Cafe.