Travel in Sichuan

1---Jiuzhaigou National Park 2.---Mt.Siguniangshan (Four Maiden's Mountain) Scenic Area 3---Daocheng Yading Natural Reserve 4---Huanglong Scenic and Historic Interest Area. I may travel to the above destination.
May i know that.
1.The is long-distance bus or local bus directly to above destination?
2.It there very difficult to travel above destination by long-distance bus or local bus during Disember period since it is winter period?
3.Is the above destination too cold / extremly cold to visit during Disember period since it is winter period?
4.Or it is ok to wear on the winter jacket during my visit the the above destination?
5.Is the guesthouse there is OK and provide warm condition to keep us stay warm during Disember period since it is winter period?

I appreciate your reply n make my journey to Sichuan will be more convenient. Thank you.

Tan Li Li From Malaysia. 9-Disember-2013