we stayed at the marmaris palace easter last year and it wasnt very good, not sure if this was due to it being the start of the season or what, but rooms are in need of revamp, very basic, food was very limited and not that good, all slides etc were closed, so please check reviews for oct before booking this hotel, we liked the location and views from the hotel, but didnt like the hotel and its definitely not 5* standard more 2-3.
we have been going to turkey oct every year and the weather the last 2 octs we had 2-3 days of rain and thunder out of the week, although temps warm, we did have some good days and at night light jackets were needed a couple of nights