See Istanbul’s fairy-tale skyline from the water on a 4-hour afternoon cruise on the Bosphorus, taking in ancient and modern sites along both sides of the strait. Spot elegant homes on the shoreline and Ottoman fortifications, the neighborhoods of Ortaköy, Bebek and Beşiktaş, deep bays and rambling palaces. Watch slender minarets and soaring domes drift by, then hear ancient legends about Kizkulesi, a Byzantine lighthouse on a tiny Bosphorus islet.