10:30 · Sultanahmet Meydanı — Sultanahmet Square
You board the shuttle bus from Sultanahmet Square. Since the meeting point is within walking distance of Hagia Sophia and the Blue Mosque, it is easily reachable from hotels in the historic peninsula. Simply be ready 10-15 minutes before departure.
Istanbul Aquarium
Since your ticket is ready, you are admitted without waiting in the ticket queue. The visit follows a 1.2-kilometer route through 17 different ocean environments and rainforest sections stretching from the Black Sea to the Pacific Ocean. Sharks, pufferfish, piranhas, penguins, and clownfish are seen along this route. In the glass tunnel, fish pass overhead. There is a café and a gift shop inside;
Sultanahmet Meydanı — Sultanahmet Square
You return to Sultanahmet Square by shuttle bus. The drop-off point is close to where you boarded in the morning; from here, Hagia Sophia, the Blue Mosque, the Basilica Cistern, and Topkapi Palace are within walking distance, so you can easily continue the rest of your day.