One thing you should catch, if in Saigon, is the War Remnants Museum. If I was American, I'd be ashamed to be in that building. The My Lai Massacre is just the tip of a particularly grim iceberg. The jars of malformed foetuses, borne from mothers affected by the tonnes of Agent Orange dropped on the DMZ shocked The Colonel to his core.
In particular, comments which have an echo in current US Foreign Policy were the comments made by the US Chief Of Staff about bombing Vietnam "back into the Stone Age". Shocking. Doing pretty much the same in Iraq, I imagine.
Even more disgusting were the actions of US Senator Bob Kerrey during his tour of Vietnam. It belies belief.