My day in Vang Vieng was rather special. I asked the receptionist at the hotel where I should go since I only had one day in town. She said a waterfall just down the road (1km) and to the right (1km). It turned out...
...to be one of the most memorable days of my trip. The scenery was beautiful and it was very peaceful. The only sounds were of birds and the odd cow. I think one was in a cave since its mooing seemed to echo.