Start with a walking tour
Your tour begins at Gulhane toward the famous Topkapi Palace. The museum has incredible jewels, gold, and works of art. Then walk through the palace grounds for fabulous across the Bosphorus. Walk back into the park and enjoy a cup of chay - Turkish tea - at one of the little outdoor cafes.
Outside the park, walk down on of the little cobblestone streets with traditional wooden houses. Fine your way to the seventeenth century Blue Mosque - named for the blue tiles on its inside walls. Then walk north for a couple of blocks and visit the beautiful Hagia Sophia mosque - now a museum.