ZhangJiaJie then ChongQing or Guilin?

I'm planning a trip with my dad to China. We are from Shanghai, so we will start there and stay for a couple of days, then go to ZhangJiaJie.

From there we will stay for 3 days, then wondering if we should go to Guilin, or check out ChongQing/Chendu, probably overall we'll have 2 -3 days for this leg.

Then return to Shanghai for a couple of days before heading back to the US.

I like nature but also ChongQing seems very cool (based on instagram...). I've been to Shanghai a few times so it's not too new to me, but also I haven't really scratched the surface there either so maybe that's enough "city" for me.