Waterfalls are not only beautiful, but they can also produce hydroelectric power if dams are built in rivers with a power generating plant to produce electricity. Environmentally this may be a sensitive issue, but as a whole it may be part of the solution.
In Vietnam, hydroelectric power supplies as much as 41.55% of the total electricity production in the country (World Bank compiled number). In comparison neighboring Thailand only produces about 7% according to Wikipedia.
Coffee is grown extensively in this mountainous region of Vietnam to fuel the thirst for beans to roast and supply to the numerous Coffee houses in todays Vietnam. Coffee and coffee houses are very popular. Cong Caphe is one of the most popular ones. In Saigon coffee houses can be found in apartments, like Coffee Apartment. Directions here if you would like to check it out.