Exit your hotel for the Antalya airport early in the morning. Depending on the location of the room, the collecting period is 3:00-4:00. The departure time is 8:00 a.m. and the time of arrival is 9:15a.m. You will drive to the old city of Istanbul after meeting your tour guide and start your tour.
First, visit the palace of Topkapı, a place of Ottoman sultan's residence that exhibits in many sections the imperial treasury, the holy Islamic relics of Prophet Mohammed, Ottoman gold jewellery. You'll then have a free lunch time for one hour. Istanbul offers a wide variety of cafés, fast food shopping and trendy restaurants.
You can hit Hippodrome Park, Constantinople's sport and cultural hub after lunch. The statues that decorate the hippodrome are Serpentine Pillar, Theodosius Obelisk, and Wilhelm II German Fountain. Blue Mosque (Sultanahmet) is next to visit in the historic center of the town. Constructed in the name of the Sultan Ahmet and regarded as the Blue Mosque, this historical mosque with its distinctive 6 minarets has a blue tile decorating the walls of its interior. As an effective mosque, during five daily prayers it is opened to visitors for half an hour.
The Egyptian (Spice) Bazaar is the next spot you can see. You can do it while you buy some souvenirs, Turkish delight, spices, etc. Then on Bosphorus sightseeing cruise (optional for an extra cost), you will experience Istanbul at sea. You will have a dinner at a local restaurant prior to your return to the airport (extra charge; hot and cold starts, salad, fish / meat balls or pasta, fruits or sweets). You will travel back to Antalya at 9:00 pm to Istanbul Ataturk Airport around 8:00 pm. A drop-off hotel concludes your trip.