Another great venue for kids is opening very soon in Akasya shopping mall in Istanbul. Kidzania is a kid city where children up to ages of 14 can learn through role playing and doing certain tasks. Here is more information about Kidzania: http://istanbul.kidzania.com/en-us
The tickets are available on www.biletix.com
To go to Akasya mall, take Marmaray train towards Ayrılık Çeşmesi and change over to the metro heading towards Kartal and get off at Uzunçayır station. OR get on the metro at Kadıköy and get off at Uzunçayır station.