For an independent walk, I recommend visiting the Nimaru cave in Marmaris. You can get to it by dolmush, it is located opposite MM Migration, which is not far from Fountain Square, and on the opposite side is Yalchin Market. We went to the cave in June 2022, below I took a picture of the dolmush schedule, according to the schedule it is quite successful, with an interval of half an hour. The ride takes about 35 minutes, at a cost of about 16 lira one way, taking into account the course, I can't remember exactly) It's very close to the drop-off point, about 5 minutes from the main entrance. The cave entrance itself is located to the right of the road. There was not a soul on the way to the cave, and at the same time it was absolutely not scary to walk, only the singing of birds could be heard and such a sense of peace and security covered it, which is even unusual. During the inspection of the cave, a little later, a couple of tourists came down, they rented a car to get there. Upon exiting the cave, they did not go up to the observation deck, but decided to walk along another branched road down from the main entrance, which leads to the yacht club. But we did it in vain, because there was nothing interesting there anymore) There are a lot of photos, but they do not convey the beauty of the cave inside...
The cave is located in a nature park. Admission is free. We drove to the entrance to the park by car. Then you have to walk along a rocky path. A cave is more like a large grotto. Bizarre stalagmites grow out of the floor. We were there alone in the morning and were able to enjoy the atmosphere of mystery and silence, broken only by the sound of drops falling on stalagmites. After the cave, we also walked around this park, there are viewing platforms with stunning views.
The cave, or grotto, is really steep, stalactites, stalagmites, you can directly watch how they form.
But it is in a restricted area. It is forbidden to enter there, as the police explained to us, who caught us and other people at the exit of the park gate, where the cave is located. We wanted to take a very large fine, but in the end everything was probably limited to a warning, although we signed a paper that we passed and violated, but it's not so easy to take a fine from foreigners, so they won't let the case go ahead, as the police themselves told us.