There are certainly quite a few little playparks scattered around
Icmeler - I don't know where you are staying, but for instance, there's one just off the top of the canal, behind the taxi rank. Some of the bars and restaurants also have little play areas for wee ones, and there's a new mini golf area at the Linekars bar on the beachfront. These are just a few suggestions - I am sure other people will be able to come up with others for you. Hope you have a great holiday - the Turkish people love children and will make a big fuss of him wherever you go.