We have set up a temporary itinerary:

Day 1: Fly to Hanoi, night train to Sapa
Day 2: Visit Sapa, night train to Hanoi
Day 3: Visit Hanoi, or may be Perfume Pagoda
Day 4: Ha Long Bay
Day 5: Ha Long Bay
Day 6: Visit Hanoi, and fly back to Singapore

The trip shall be from 7th May to 12nd May 2005