I loved Istanbul so much on my two visits to the city in 2013 that I have now booked a third trip for May 2014. I am looking for areas "off the beaten track" and have stumbled upon this link on the Şehir Hatları website...
Firstly, having already seen the Rumeli Hisarı and the Emirgan Park, is there much else to do or see in this area, particularly around the Sariyer port and the Black Sea coast? I am thinking about perhaps museums, picturesque areas in which to stroll, maybe some local culture.
Secondly, does this new ferry service accept the Istanbulkart as payment?