Yes most places are open but looking at the webcam it doesn't seem that busy unless their all on the beach in the shops,eating drinking or having a lie down! It will probably pick up in the next few days as most people don't travel there until end of May beg of June..I am flying tonight to Dalaman and can't wait!
I was in Icmeler last week and it was still quiet, though everywhere seemed to be open.
I like it when it's not so busy, but I know it's not good for business out there!