as a Vietnamese, thanks for guys have nice compliments
My advices is in Vietnam, particularly big cities (e.g: Hanoi) be really careful, watch out your belongings: wallet, passports and etc, always ask prices first (hope they know what you are asking about). I highly recommend other more remote places like Ninh Binh (with Cuc Phuong national forest), Ha long bay (very tourist oriented now), Sapa, Hue. Wish you have good time there