While no one really wants to get too political while on vacation, it is good to know a bit about the industry of the area as it can sometimes help shine light on the way things may be done.
Since the end of the Vietnam war in 1975, the country has been working to rebuild its infrastructure and create confidence in the tourism industry. The country has done such a great job at the tourist aspect that a lot of people love this country due to its mixture of architectural beauty, cultural heritage, and scenic magnificence. It is also the reason why Halong bay is currently ground zero for a battle between developers that want to create an entire new landscape and those that want to keep the area natural. If the developers win then the locals and their fishing villages will be squeezed out by deluxe resorts which will lead to an abundance of tourists.
The mining industry is already starting to destroy the area although it is providing jobs to the locals so they are some what used to the tourist, developer threat to the area more than most realize. For example, in 1969, over 40% of the area was forested but now it has dropped down to 15%. On top of that 300,000 tons of slurry (a very toxic liquid waste from mining) is dumped into rivers that lead to the ocean. However as Vietnam is a communist country and the largest mining company is state owned plus Vietnam is the largest exporter of anthracite (a highly sought after form of coal that 92% pure carbon and burns clean with no smoke), there is no end to this environmentally damaging activity.
While this information does shine a bit of a dim light on the area, I hope that it will have you wanting to spend money in the local villages on things like textiles and tours so hopefully tourism can start to supliment the wages of those that do not want to work in the mines.