Hot, humid and congested. I had to stop for hydration very frequently and any area with air-conditioning was much appreciated. The trick to crossing any road, especially the one outside the Ben Thanh Market, is to just keep walking. The motorcyclists will avoid you as long as there is not a trace of hesitation. But then again, you might want to skip Ben Thanh market as the food is as stale as the clothes for sale.
All the museums were interesting (War museum, history museum and reunification palace), but exercise some discretion when reading descriptions. We found a picture of a genetic disease known as Neurofibromatosis that was labelled “after effects of Agent Orange”, amongst the more legitimate photos of radioactive destruction and malformed babies.
Would recommend doing the museums and leaving for fresher air as soon as possible.