On the way to Jiuzhaigou in Chengdu, you must pass through Maoxian County and Diexi Haizi. The bus stops there to rest and you can see the scenery of Haizi. There is only one viewing platform, and locals take pictures with white yak. There are also some vendors selling various mountain goods. According to the tour guide, that place is full of pepper peppers, so you can buy some to take back, others... it depends on you are happy.