Just discussed with Adeline, we almost decide on how the trip going to run. There are basically 2 plans that we hope either one will works.

Plan 1

Day 1: Night train to Sapa
Day 2: Trekking in Sapa, night train back to Hanoi
Day 3: Ha Long Bay
Day 4: Ha Long Bay
Day 5: Hanoi
Day 6: Hanoi and back to Singapore

Plan 2

Day 1: Hanoi
Day 2: Halong Bay
Day 3: Halong Bay, night train to Sapa
Day 4: Trekking in Sapa, night train back to Hanoi
Day 5: Hanoi
Day 6: Hanoi and back to Singapore

Other sights most likely will be dropped, as we’re short of time. The main problem that we faced are booking of train tickets to Lao Cai and Sapa and also which tour to take for Halong Bay. Later one is easy to solve, but for train tickets, there is no online booking and the counter seems to close pretty early at 7 pm. Let see if we can get a kind tour agent to book for us.