Chengdu does not typically have clear blue skys so landscape photography can be frustrating. Consider somewhere like People’s Park just off the city centre and get shots of ordinary Chinese people dancing, singing, playing musical instruments, paddling boats etc. If your timing is right you might catch the Ginko trees in their autumn colours.
There are a ton of things to photograph in Sichuan province, I would say head west toward Tibet, in the mountains. In the city it’s hazy but outside of the city it’ll most likely be clear. It’s amazing what you see just a few hours outside of Chengdu.