Great city; the traffic is an experience in itself, the natives are friendly, everyone is happy, english is widely spoken but try and learn a phrase or two (always important wherever you travel).
I agree with others: Chu Chi tunnels, Museum of American War Crimes (sorry, now called the War Relics Museum), Reunification Palace, the Walking tour out of the city from the Lonely Planet, all good.
Always felt safe, the food and bear is cheap; although wine is relatively expensive (although @ $10 it is cheaper than here).
Have fun; but why stop only in Saigon; the whole country is fascinating.
