considering to visit Jiuzhaigou end Aug 2011 ,starting from Chongqing taking bullet train to Chengdu

thereafter transport us (2 persons) to Jiuzhaigou on free n easy tour.my questions:2 days is enough to cover the tours of JZG and Huanglong only? wish to stay 1 night at Chengdu and next day by bullent train from Chengdu heading back to Chongqing to catch flight home to Spore.(remember only JZG and Huanglong
trip);i need to know what transport I need to take and visiting times required to visit these two places.
best regards