the dolmus service from Icmeler to Marmaris is every couple of minutes, the dolmuses in Marmaris are colour coded, its orange to Icmeler, then hop onto a light green dolmus to the otogar, buses always parked ready for Fethiye, as previously stated they are 20TL each way (I pay on the bus) every 30 minutes from about 06.30am - 23.00 , direct, no changing busses they stop briefly at other towns on the way. I have never , pre booked a seat and have always found a place on the bus there and back. To save me going into Fethiye I get off at the Citroen garage at the top of BMB and walk down and when going back I walk to Gunlukbasi and get on outside the Pammukale office, the Marmaris bus almost always stops there. its an easy journey, can tend to be a bit hot and stuffy in the summer months.