1) Visit Van Mieu, the first university of Vietnam.. (maybe the first in Indochina)?

2) Visit Patin Square and took photo with Ho Chi Minh Mausoleum.

3) Take photo with Lenin (you don't have to fly to Russia for that...)

4) Checkout Malaysia Embassy (it seems like much beautiful than any government building at Putrajaya)..

5) Get tired? relax yourself with Vietnam coffee or Hanoi Beer (Bia Ha Noi)...