Should've said also, if you've got hand luggage, try to get a trolley as soon as you get upstairs to the mall. It's a pain carrying stuff around, they're not like supermarket trolleys, they're smaller and higher. I got chips in a burger type place and they wouldn't accept coins so I'm not sure if the main shops do. Just off the malls there are seats and loungers if you need to take the weight off.
your question wasn't stupid, if you don't know you don't know! Feel free to ask anything else, if I can help you I will x