I am traveling to the Yanghuo area of China approximately 30 Oct through 3 Nov. Both the Longshen and Dragon's Backbone rice terraces sound fascinating, but I also definitely want to experience the Karst formations, and ancient villages. How different are Longshen from Dragon's Bbone? It sound like DBB is more centrally located for mountain and village touring. Has anyone done both, and what might you recommend for four days in the area? Many thanks.