If what you expect from a summer holiday is somehow different from the mainstream, this part of Fethiye offers you endless possibilities. Butterfly Valley is one of them, and Kabak is another very good option. And the ever-growing popularity of the Likya walk is another phenomenon.
The last time I was in Kabak was in 2004. After a trekking activity that lasted about half an hour, we reached our destination. What we got was a primitive facility where you sleep in tree houses and share the food prepared all together at the same table. We stayed there one night, and the experience was really a welcoming one. The beach was spectacular in a way that only the ones who knew this secret bay enjoyed at the time.
Update: I am hearing about Kabak from here and there quite frequently, which is a sign that it is no longer a hidden gem. But this is not necessarily a bad thing. I understand now there are a couple of boutique options to stay in the area, which still intend to provide you with that primitive feel.