If you get the opportunity, I would visit the worlds tallest building, Al Burg Khalifa. It is located at the Dubai Mall. If you purchase your ticket 24 hours in advance at the Dubai Mall; it is only 100AED. But, you do not have the time, it will cost you 300AED. I purchased my ticket in advance.
Please bring a camera ! The tour take approximately one hour, and you will take the extremely smooth elevator to the 124th floor, in a matter of seconds. The view was fantastic. There will be a photographer there to take pictures, and you can pay for the picture when the tour has finished. Please take your time when you make your decision about photo purchases. You will enjoy this adventure.