... shop. I can only comment on Ho Chi Minh City. Was there in Dec 2005. It's not everyone's cup of tea - it's mostly a commercial centre, and noisy and dusty and commercial. Still, we managed to enjoy ourselves. We didn't do the tunnels, and kept the sightseeing to a minimum, but the eating and the shopping was good. For more details, you may want to check out my travel blog for that particular trip:
blobbes' HOliday in HO chi minh city