From Jiuzhaigou to Chengdu by bus.

Hi, I plan to arrive at JZG by air from Xi'an in the evening on Saturday. See the National Park on Sunday and Huanglong on Monday (or the other way round) and then travel by bus/charter to Chengdu.
Where will be my departure point in JZG Scenic Area?
Is the bus ride one continuous ride or will we stop to enjoy scenery?