I am planning to go to Bangkok in June for 4 days but I do not know which shopping destinations to shop?

I am going with my two girls aged 17 and 13. Which one "must" visit, MBK, Platinum Shopping Mall, Khao San, Papong night market, Chatuchak Market or China Town Market?? Can anyone who have been to these places, please advise me. Thank you soooo much :)