Halong Bay is a must. join a tour for at least a night spend on boat in the bay to enjoy the tranquility preferably 2 nights.

2) in Hanoi , go to the Bobby Chin (the celebriy on TV) Restaurant - that serves good cuisine especially French. It is near Hoay Khiam Lake (Old Town Centre)

3)if wake up early , 5 or 6 am, have a walk around Hoay Khiam Lake.

4) Must see, the one and only one "water puppet Show' in the world, only in Hanoi town. will regret if you do not .

5) Must go to the old town , the 36 streets selling all different commodities, where one can see old buildings and old cultures.

Enjoy.