It would be at least a 10 minute walk to Icmeler and at least 20 minutes to the start of Marmaris/siteler, However the dolmus stops at the top of the road to go into Marmaris and across the other side to Icmeler.

Have a look on the map below marmaris park is number 121.
http://i127.photobucket.com/albums/p134/theGunny1/mapofmarmaris.jpg

As Robert said ,10/20mins .The walk to icmeler is one of the nicest you will ever get it follows the sea along a broad monoblock pathway ,with some small cafes at intervals .The views over the water are stunning .You can also have a wee dip in the water if you want.