Here's a great day trip idea from Istanbul! Spend the day exploring the sleepy fishing village of Şile along the Black Sea.
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My Turkish Joys: Exploring Şile – Day Trip from Istanbul http://myturkishjoys.blogspot.com/2013/01/exploring-sile-day-trip-from-istanbul.html
http://www.traveladvisortips.com/day-trips-from-istanbul-where-to-go/ - Day Trips From Istanbul – Where To Go?