Don't look for a sandy beach, cause there isn't one. Hardly any resorts on Coz have sandy beach. THere are some nice beaches, but we only experienced them when dropped off by dive boat for a surface interval. At PLG, can lounge by very nice pool. Big rocks are along the water.
People do put towels down and sun, and snorkel some off the rocks.
You may have to spend some time reading, but there is tons of info there. Anyone with experienes of this resort - good or bad. We stayed at a condo three blocks from there. Nobody objected to us using the place as if we were staying there. Didn't see the rooms, but have heard they are very nice.