Thanks Daawgon for your thoughts.
This absolutely wasn't my first choice for exposure to Vietnam and I am really limited by the brief Sunday night. (All due to finding upgrade space, of course LOL). It just doesn't feel right to be in a new country for a night and not venture out and see something, as brief as it will be. Some cheap goodeats (

) and beer sounds like a decent start.
I am a frequently in Thailand and sure I can handle the various scams and such (thank you for the warning about those). Is there any worry about just walking by myself from the Renaissance (by the river) over to Bui Vien?