We will have 6 hours in Mykonos around the 10th of July and want to visit a beach. Our cruise excursion options provide for either Kalafatis or Elia Beach. I have tried looking at pictures, but always leery of trusting them too much. We would like a sandy beach with safe swimming - don't need to have beach activities to occupy us. We are in our 60's and just want to relax, soak up the sun and marvel at being in Greece. Which one would you recommend?