This is one of the best beaches to visit if you are staying in Istanbul (I know that you don't go…read morethere for beaches but sometimes it's nice to get away from a very busy city). It's an easy ferry ride from Istanbul, and the beach is about a 20 mins walk from the ferry station (or you can take a boat as well).
It's a sandy beach with plenty of lounge chairs and umbrellas. There is a small bar and cafe on the property. It could be pretty busy on the weekends but the area is huge so you can always find a spot. You pay an entry fee per person once you get on the property. Overall, I've been to every Princess island, and this beach was one of my favorites.