The easiest way to get to Halong is by bus. There are several buses departing from Hanoi to Halong city where you can book a boat tour to visit the bay.

Montagne Fansipan
Depuis Hanoi, vous pouvez rejoindre Sapa en train ou en bus. De là, vous pouvez facilement rejoindre la montagne Fansipan en moto,
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Such an impressive place! If you want to stay in a less crowded area, I recommand to stay in Cat Ba Islands, which is quite the same landscapes as Ha Long Bay but less touristy!