Very few places open and very, very quiet.
On the plus side, if you can find a flight and somewhere to stay, you won't have a problem finding a free sunbed.
That is if you don't mind getiing wet and cold in the rain and wind!
As previously stated
Marmaris is probably a better bet because many more places will be open.
But if it is hot and sunny weather you are after I would give it a miss.It's unlikely you will get a tan.
Hope that helps.