Breakfast in Europe, Lunch in Asia, Dinner in Europe
During my two visits to Istanbul, I spent most of my time in the Sultanahmet/Golden Horn areas, but a short trip just across the Bosporus to Kanlıca to spend some time in Asia is a must. Also, a cruise up the Bosphorus as far as the Black Sea is nice. Both are very inexpensive and easy to access. Istanbul is the only city in the world located on two continents.