Hi, I am coming to Yunnan with my extended family (8 of us including 4 teenagers) for 10-14 days in December. We will stay in Kunming, then visit Dali, Lijang, walk Tiger Leaping Gorge, then back to Kunming. After which we plan to travel down to Vietnam. I am wondering the best travel option for that leg of our trip - is the only land option for traveling to the Vietnamese border a sleeper bus or can we travel part way by train, perhaps see more of the country before traveling onto Vietnam? What would you advise?