It doesnt take long to get to Armutulan.  If you get a dolmus say around the  Point Centre in 
Marmaris then the journey to Armutulan will only take around 10+ mins.  The terminus is in Armutulan Square.   Theres a few nice bars and restaurants in the Square itself, for example, Mustis Fun Pub but you only need to walk for a few minutes and you will come to the main Adnan Menderes Cad.  Theres loads of bars/restaurants right along that street.  
Alternatively you can go from 
Icmeler right along to the Old Tansas and get a dolmus there.  That will take you another route but you will still end up in Armutulan but along the other side.   Hope this helps.