Tip: There is a back hallway with glass viewing windows not many people know about and free of charge. Go to the Chili's restaurant on the middle floor. Make a left before entering the restaurant to get there. You can avoid the big crowds from the main part of the mall and get a great view of anyone doing the shark diving in the cage.
Dubai Mall can easily be reached by metro trains on the red line. Exit at Burj Khalifa/Dubai Mall and follow the covered walkway for 750 meters until the entrance of the mall. There are moving walkways to make the distance seem shorter and plenty of air conditioning during the hotter months.