I was lucky enough to spend a whole day at Büyükada Island. Sometimes the huge city of Istanbul can be overwhelming and a day trip to these islands can be exactly what you need. My main destination on my trip here was the Agia Yorgi Church and Monastery which dates back to the 6th century. I would recommend getting a horse ride up, but the walk down is beautiful. Any Cafe along the shore will serve up the freshest fish - don't even worry about missing the last ferry out. Prices for hotels here are reasonable despite there only being a few.