Except for the word Pizza, nothing comes to mind :)
Preface: it's better to buy a ferry ticket for 4 lira, instead of cooperating with this company!
We bought two tours for $ 20 and $15. It is very difficult to call it an excursion. On one, we were just taken for a ride along the Bosphorus and the Golden Horn, simultaneously throwing in facts about certain buildings for 5 minutes. At the bus stop, the guide did not even tell us anything about the place where we sailed. Well, that's okay. All the fun started on the second trip to the Princes' Islands!
The transfer followed us for 1.5 hours! They got my name mixed up, so the whole ship was waiting for us. Arriving at the pier, we saw that the whole ship was filled with Arabs (we are not rastists) and we listened to their music and their "show program" throughout the "tour". Only in Arabic!
Two more Russian-speaking people bought the "excursion" for 25€ per person.
No one told me anything on the islands either. The lunch was not bad.
Anyway, this is a typical trap for "stupid tourists". It's not a pity for money - it's a pity for precious time…