Take a bus from the main station in
Marmaris to Orhania (spelling ?) We did this a couple of years ago and had a great day out. There is a small marina there and a few small bars. We had lunch in a bar by the sea, no menu just whatever had been caught that day served with a salad. I think the bus is about 10 am and returns about 4 pm. It's in a nice little bay and sunbeds are available at the bars. I also think there is another small village a little further on.