Drinks are pretty cheap (bottles for USD60-70), and avoid the fruit platters if you wanna save some cash (its a rip off at USD20-30 per plate), but girls do love these.There is also a live band joint called Napoli (7 pham ngoc thach) with lots of hot girls serving drinks.
Experience has shown that dating Southern Viet women tends to be a bit more straightforward though, based on nothing more than they've had more positive experiences with Western men than their northern counterparts might have.
There are also girls here that will drink with you and take a small tip from you at the end of the night (USD3-5), they're not hookers, so you can get their number and date close them if you're interested, ONS is tougher as they work there till the club closes around 4am.
Also, there are security guards everywhere and there will be one assigned to your table, good idea to tip him upfront when you get there so he looks after you (sometimes they pull groups of single girls to your table without you even doing anything), they will also cockblock you from girls that are with guys from other tables, good way to prevent fights.
You can see the French colonial influences in many of the older parts of the city, which thankfully survived the conflict.
One key point to mention is that sex tourism is not only frowned upon but is illegal here - prostitution is a serious crime, so avoid any of the "easy girls" you might bump into on your travels in and around the city.