The Bosphorus boat trip is one of the coolest things I ever did while in Turkey. The boat trip costs no more than $10 (be sure you shop around and not pay over the odds) and takes around 6 hours. You get to have a stop over at the end at Anadolu Kavagi and see loads of things to see along the way such as the Ortakoy Mosque, Dolmabache Palace and Bosphoros bridge. The views are stunning...highly recommend doing this!
Bosphorus Cruises in Istanbul I agree very much with this. Stay clear of taking private Bosphorus Tours from the docks of Eminönü because they make their tours overpriced and shorter.Istanbul’s official ferry company is the best way to enjoy a tour of Bosphorus tours. You can do one for as little as $5 (10 turkish lira).