Slow things down at Yildiz Park. Kick back with a magazine or find a shady spot on the grass to rest for a while.
You'll find this recreation and green space in the fishing district of Besiktas. If you're watching your budget, you'll be glad to hear that it's free to visit. Toss in nearby sights like Blue Mosque, Hagia Sophia and Topkapi Palace and you have yourself an itinerary for a great day out.