Legal. Opinions. All generalizations are false.
Vietnam, 2505-015 … VUNG-TAU aka “Saigon-on-sea” is a substantial seaside city, somewhat “off the beaten track” for Farang backpackers... HOTELS are often empty 6 days a week, Saturday night is “the payoff” and rentals can be a lot more – beware foreigners!
“Back Beach” is mostly Vietnamese FAMILY accommodation, and does not cater for much else. If you can't (or don't want to) shout in Vietnamese, avoid it. Particularly on Saturdays. You are likely to be ripped off by hotels there
“Front Beach” has more amenities and social structure, and many boats both moored and passing .. Hydrofoils travel to Saigon