I've not heard of a ferry, nor a one day boat trip. only gulets that take 2-3 days to go back and forth. They are start and finish at the Harbour, which you can get to from Ichlemer by water taxi or dolmus.

Private transfer by car would take 1 - 2 hours. Not sure on price.

there is a dolmus/coach service i think

thx for help but if theres no daily trip its no use them coming from fethiye to marmaris for a day ,takes too long on the dolmus or bus just thought there might be a trip