hi
we always stay in dalyan for our holiday, sometimes icmeler... there is one dolmus out of dalyan daily at 10 am to marmaris, taking about an hour, then obviously you get the dolmus from there to icmeler. then you would have to get back to
marmaris for 4pm for the return journey. the only other way would be to get the regular dolmus from dalyan to ortaca and change there.... not done it this way, so not sure how often dolmus leaves from ortaca to marmaris.
hope this helps a bit!