The journey from the "Four Roads" traffic lights close to Gokova (turnoff from the Fethiye-Mugla road) through the hills to Marmaris is worth the bus fare by itself. Lovely scenery - and look out for the roadside display of copperware at the right hand side of the road on the bend at the end of Cetibeli*.
* This assumes you are going by bus. If driving you should watch out for the Jandarma check point at exactly the same spot that hauls in drivers distracted by the flashing sunlight from the display.