I dont personally know Ovacik or Hisoranu, but i am sure there will be some activities organized that will be suitable for you, but I do know it is much quieter than in the summer season so dont expect noise and discos !!
FiG are organizing a few special nights during those months if you can get down to Fethiye and Calis, full details will be advertised on here soon
Anyway just wanted to say have a good time

And yes , you will feel cold!!