Some highlight I highly recommend you:
Escape the crowded city (13 km from center), passing the bridge cross the Red river, explore a very northern Vietnam’s village.
On arrival, take a visit to the Bonsai garden. This is the place where you can see hundreds of bonsai available. From glasses to the wood trees, by the experienced hand of the gardeners, all have the very special performance. The next garden are the home of many kind of flower: orchids, rose, jasmine…
Then visit some relics from the 18th century…The statue of a famous princess came from a very famous legend. There is nothing special but it is a headless statue…The princess married a prince without knowing that he was a son of the enemy.
or It tailored by yourself.
Come back to Hanoi.