Vietnam has the most beautiful women on earth. Come here and you won't even comprehend what you see on a day to day basis. The only other country that even comes remotely close to here is Taiwan then the countries nearby folow.
That's good, Fly. Based on experience, locals are impressed to hear foreigners speak their language. I know @quantumleap can relate to this situation as well.
Like fly says, it's a very difficult language to learn. One would have to be immersed into the culture to keep it fresh in your mind. Otherwise your likely to forget it.
The only way I'll learn Vietnamese is if I move there for an extended period of time, then I'll be happy to give it a try.