A cruise on the Bosphorus is probably the most overlooked Istanbul tourist attraction. Understandable, with such an abundance of historical sightseeing spots in Istanbul and too little time to squeeze them all into your short holiday. But take my advice and set a few hours aside to take an unforgettable Bosphorus tour. Certainly, if you’re in town between May and September. You won’t regret it — at least if you follow these simple guidelines.