Air conditioning is a must so if you don't have it in your hotel maybe take a little extra money to buy or rent a couple of fans when you get there. It is EXTREMELY hot here in the summer months. Also don't visit the McDonalds near the coast because it is manky! Oh and get a boat trip to Kos if you can, it is a really lovely little island, definitely worth the hour or so boat trip to get there! Have fun!
You could try www.holidays-uncovered.co.uk which hsa favourable reviews on Club Anastasia.On the main page there is a link to "review database",click on that then scroll down to Turkey and under that you will find Marmaris C. Just a case then of scrolling down to Club Anastasia,there is a few reviews on it.