Please add further information: such as what summer camp to go to, how many days to stay, whether the school is responsible for accommodation, whether it is closed management, and where it is in Qingdao. Personally, if a child is generous or likes shopping, five or six hundred should be enough for him to spend three or four days. After all, it is a group activity, and it is impossible to sweep the goods.
The seafood in Qingdao is good, but as long as you know the location before you go, you will definitely spend the least money and get the best experience. However, if you don't make some preparations, it is normal to be slaughtered for four or five hundred meals in the food stall of the trestle as soon as you go to Qingdao.