For hardcore fans, I don   t have to say anything, they will go no matter what I said. But for the other, a few tips: First, check if it is a long holiday in China such as labour day in May, national day in October or Lunar new year in around mid Jan to early Feb. The place will be all packed withChinese tourists.Second, IMO, please don   t go on a hot summer day (which is like mid May to early Oct) It is so so hot and humid. Imagine waiting in line with bunch of sweaty people all day.Well, that leaves us on Nov, Dec, March and April, which you get the best weather, less pack.Third, buy the fast pass even if you are going on the months I suggested. Without the fast pass, you and you group will basically wait in line pretty much all day probably only making 2 3 major ride.