I have been there last year. Dalaman is little boring I must tell. Fethiye would be nicer to have a holiday which is 1 hour to Dalaman. I booked my trip with Metis Travel and they were very good and responsive
Dalaman is a beautiful place to visit throughout the year. It has beautiful white sand beaches and one can laze around in sun near a palm tree. It also offers excellent seafood. The day climate is bearably warm and the nights are moderate too. Do pack a sunscreen if you are going to visit the beach a lot.