There are many historical sites to visit including palaces like the Dolmabace and the Topkapi. The Princes Islands make a day's visit. There is the Bazaar, the Beyazit Tower and Istiklal Street as...
You can visit Blue mosque, take a walk along the Bosphorus or go to luxery shpo centers as Istinye Park or Ak Merkez. There are more then 10m people so you may not get bored.
Istanbul is on Time Zone: 3 PM = noon Greenwich Mean Time (GMT) which makes it 4PM local time in Istanbul.
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