Day 1 - Princes Islands ( Grand Island )
A trip to one of the Princes' Islands will take almost a full day. Wake up early morning and have your breakfast before the unforgettable day trip to Grand Island ( called Büyük Ada in Turkish )
Take a tram from Laleli Tram Stop ( T1 direction to Kabataş ) to reach to Eminönü, it is where you will take a ferry boat to Grand Island.
Time Table for Ferries
http://en.sehirhatlari.istanbul/en/timetable/eminonu-kadikoy-adalar-3485.html
Day 2 - Taksim Square, Istiklal Street and Galata Tower
Istiklal Street and neighbourhood is must see in Istanbul. Take a tram from Laleli Tram Station to Kabataş ( last stop ), when you reach to Kabataş tram station you will see a sign says to METRO called finicular ( F1 ) it takes to Taksim Square.
Taksim Square is most famous place in Istanbul it is like meeting point for Turkish people and also Istiklal Street ( Caddesi ) is about 1,4 km. long where you will see a lot of boutique shops , restaurants and cafes. Taksim is also very famous for Night Clubs.
Visit Galata Tower it operates solely as a touristic attraction by a private company. The elevator only goes to the 7th floor, and the last two floors of the tower must be climbed by stairs. There is balcony on top floor where you can enjoy 360° View of Istanbul.
Day 3 - Emirgan Park and Sariyer
The Emirgan Park is a historical urban park located at the Emirgan neighbourhood in the Sarıyer district of Istanbul, Turkey, on the European Tcoast of the Bosphorus. It is one of the largest public parks in Istanbul.
How to reach to Emirgan Park from Laleli
Take a tram from Laleli Tram Station to Kabataş ( last stop ), there is Bus Stop it is just next to Kabataş Tram Station than take a bus ( number of the bus is 25E ) from Kabatas to Sariyer.