The Ha Long Bay is a bay near the city of Ha Long. A short multi-day trip takes you by "Jonk" along the many chalk rocks and small rock islands. Some chalk cliffs contain stalactite caves that are visited during the boat trips. Definitely worth it for someone who loves nature and/or stalactite caves.
Info
Arrive
Halong Bay is easily accessible with a tourist trip from Hanoi.
Entrance
Travel around
To look at
It is also an experience Monkey Island where rhesus monkeys roam free. Be careful because there are a few old grunts among them that are not too fond of attention.