Often when transiting through a country we end up doing our running on treadmills in a gym. I’ve found a great alternative in Istanbul. The Polat Renaissance hotel is about a 10 minute drive from the airport and is on the Marmara sea. There is an excellent 10 km out and back run you can do along the coast as you can see below.
The run is flat on a concrete surface. Excellent for speed work. You will pass through a fishing village and see lots of very friendly cats. Just go out the front door of the hotel and turn left.