I do a little research and thought 3 full days in Zhangjiajie would be nice. Did I understand it right and they are two parks and I have to pay entrace for each of it? Tianmenshan Mountain and Wulingyuan Scenic Area? So I could spend two days in Wulingyuan Scenic Area and one at Tianmenshan Mountain.
K968/K965 would be an option if I cant get K268, but I would prefer the train starting 12:47. Could take it a day later so I will be in Beijing only for the daytime and go to the airport same day. Just want to meet someone for a couple of hours and try a peking duck because I didnt try it the last times I was there
Dehang looks also very nice, but I think there is no time to go there. Seems to be a very small village with only a few tourists. Sounds like fun, but I think its better for another time of the year than the winter, so I should go to Fenghuang.