I have a night time foodie on a vespa in Hanoi our second night there. No plans as of yet for HCMC but thinking of a night time tour. I have had good luck with Trip advisor in the past. The only problem is I never know what time the daily tours end so sometimes I have to cancel the scheduled trip advisor tour. I am hoping that next month, I will be able to ask AMA the timing of the daily tours.
Thank you for all the info.