There are lot of activites inside a mall that you can do to keep yourselves enjoyed and entertained. First and foremost, you should have a money for all of your whims that you want to buy (if there is any).
You can go shopping with your family or friends to any shop/store you like, as well as when it’s time for you to eat.
You can also take several pictures at a particular place of the mall where their props and designs for a particular season (e.g., christmas and valentines season) are displayed.
Additionally, you can stay and bond with the people you’re with at some place anywhere you feel comfortable, or you just can roam around the mall if you like.
These are just a few things you can do, at the end of the day, it’s still your decision on how you want to spend your time inside a mall.