Altınkum (“Golden Sand”) beach, a few kilometers south of Didyma and the Temple of Apollo (map), was just a beach when I first saw it many years ago. It is now a popular summer beach resort with dozens of hotels, villas, restaurants, and holiday fun activities, popular with British and European visitors as well as Turkish vacationers.
If you’re interested in a hotel or renting/letting a holiday villa or apartment/flat near Didim or Altınkum, you may find it here:
Altınkum is also a popular stop on day tours from Kuşadası and Selçuk (Ephesus) that visit the three ancient cities of Priene (Prien), Miletus (Milet), and Didyma (Didim), then finish with a swim at Altınkum Beach.
Here’s how to do the Priene-Miletus-Didyma excursion on your own.)
Here are more maps of Aegean Turkey.