hi
a- temp is good, not too cold and not too hot.
b- for the glass you can go to jiahe jewelry market.for the cloths you can go to zhanxi road cloths wholesale, and baima and yima fashion cloths.......For the jade, if you want to buy janion jade you have to find Hutan jade, it is not easy to find janion jade in guangzhou if you have no contact, if you want expensive janion jades you can contact with me....
c-almost all kinds of night clubs can be found here.
d-you can go to white cloud mountain and yuexiu park,and can injoy from the night scenery of the perel rever.
night time in guangzhou same safe as it is in day time ,as too much people will be outside at night........