Will be using Air Asia to fly from Bangkok to Shenzhen. The reason is that Air Asia is half the price of other airlines from Bangkok to China. Can one utilize the high speed trains to get to either Shanghai or Beijing from Shenzhen? Or for that matter any trains? How many days should I spend in Shenzhen? I am greatly surprised at the low rates for some 5 and 4 star hotels in all of the Chinese cities. Agoda gives many 5 star hotels at below $50 per day. I would have thought that the rates would have been 3 and 4 times that amount.