Maybe the best experience in Hanoi was jogging in the rain around Hoam Kiem Lake, location of the red Huc bridge. Also, the Backpacker's Hostel. Great place for meeting other travelers- mainly Aussies, Brits and Canadians during happy hour on roof-top deck.
Hanoi is famous for water puppetry. 1,000 year old art form, a unique and slightly bizarre cultural experience. Paired with traditional Vietnamese music, live musicians, green water and puppets of all sorts - buffaloes, swans, dragons...
Hand painted drums used in water puppet performance.