Daily tour in Istanbul will involve Blue Mosque and surrounding highlights: Hagia Sophia, Underground Cistern, Topkapi Palace, house of Ottoman sultans.
As a second alternative you can have a boat trip to see Bosphorus, and after that you can visit Dolmabahce Palace, 19th century famed Ottoman palace.
You can enrich your itinerary by including a visit to Istanbul Archeological Museum which has a very rich collection from the time of antiquity.
It depends on what you are looking for to buy. Istanbul is the largest city of turkey and it is the heart of trade and commerce. It may therefore seem to be a bit more expensive than Kusadasi but it has got more options for serious shoppers. In Grand Bazaar and places alike, it is common and customary to bargain, so make sure that you ask for reductions you will definitely get it.
If you are not the most experienced cruiser and exploring Istanbul for the first time you need to have a good guide. Your best option is to have your own private guide. Many wonderful things are awaiting you in this fabulous city.
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