We did Changping Valley as well as Shuangqiao Valley. Changpingquo is more friendly for walks as it is very well organised with kilometres of boardwalks showcasing different aspects of the Valley. Shuangqiaoquo requires you to take an internal bus for about 45-60 minutes to the top end to get up to the glacier (didn't go up) with bus-hops in between (including a stop for river rafting) - sporadic and shorter boardwalks but rewards you with spectacular reflections of the Lake if the wind does not blow too hard.