First day, go to Leshan and take bus to Emeishan in the late afternoon. Stay one night in Emeishan hotels and then climb the mountain next day. Then back to Chengdu in the afternoon. Have a rest in Chengdu. Catch up the early bus from Chengdu Xinnanmen Bus Station to Jiuzhaigou, 10 hours' journey. You can also choose to fly from chengdu. Stay one night in Jiuzhaigou and then start visiting next day morning. Hire a van to Huanglong for one day during your stay there. This is my suggestion. For your reference.