If time is tight, focus on Istanbul's Big Four: Topkapi Palace, Haga Sophia, the Blue Mosque and shopping at the Grand Bazaar. Or get your bearings on the 90-minute Istanbul City Tour, hopping on and off at several stops, before taking a half-day tour highlighting an aspect of Istanbul's millennia of history. Compare the city's European and Asian faces on the Istanbul Two Continents Tour, or focus on the city's Ottoman past on an Ottoman Relics Tour taking in Topkapi Palace, Rustem Pasha Mosque and the Grand Bazaar.
Having covered your major bases on day one, this is a day to get under the city's skin. The private tour of the Egypitan Bazaar and cruise on the Bosphorus combines shopping for spices with beautiful views from the water. The private tour of Haga Sophia and Grand Bazaar blends history and shopping at two of Istanbul's most famous sites. And in the evening, when the city's mosques and monuments are floodlit.