Vietman Naturism
I visited that place 2 years ago when I was in Hanoi. There were several other locals there, swimming, working out, doing exercises and just hanging out. One local I talked to told me that on the opposite side of the bridge is a small community where they play soccer/football in the nude or semi-nude as well, so we walked down there and joined in watching them play for a while.. most locals seemed quite surprised to see a foreigner in their midst but were all quite welcoming.. :)
Yup I also believe this is about the right time to explore naturism in Vietnam and not restricted to only Hanoi.
There are many news articles and several interviews conducted last year covering this beautiful place in Hanoi. Google and find out more. Potentially a great opportunity to be nude and socialise with a Group of like-minded people, exercising and keeping fit at the same time. This is just great!