Shop up a storm at Akasya Acibadem Shopping Center. With plenty of places to give your credit card a workout, you can easily while away an entire day hunting for bargains.
This shopper's paradise is in Üsküdar, but Akasya Acibadem Shopping Center of course isn't the only thing to see in the area. If you're eager for more attractions, Blue Mosque is worth a look as well.