Istanbul really is one of the world's great cities, and it's easy to get lost here for a few days. I loved wandering the markets of the Grand Bazaar and taking in the amazing culture.
The Aya Sofia and Blue Mosque are must sees, but my favorite hidden gem is a sunken-garden cafe outside the Suleymanie Mosque. I could spend hours lounging here, drinking tea and enjoying the conversation with the Turkish students.
At night be sure to check out the bars and clubs off of Istiklal street!