I read that some of the bros here are planning to go to Nha Trang, Hoi An etc. I came across this Chinese site full of travel blogs, tips and photos that could be helpful to you.
http://www.mafengwo.cn/travel-scenic...gwo/16104.html
Note: I'm not affiliated with the post above.
Personally, I'm flying to HCMC tomorrow, then Nha Trang, Da Nang (covering Hue & Hoi An). It's my first time there but under the guidance of Viet relatives (by marriage - not my in-laws though). I'm sure they will want to give me a positive impression of their country therefore I don't expect any chance of hanky panky. No worries lah, like Hurricane88 said there is more than bonking in Vietnam. I look at the photos in
http://www.mafengwo.cn/i/2952167.html I wish am there already.