The kids will sleep soundly after frolicking by the water at Ao Thian Beach. Look for cute critters like crabs and snails, stick a toe in the water or throw a Frisbee around!
Located in Koh Samet, this stretch of coastline is worth including in your schedule. But you'll find plenty more to see in the area. Rayong Aquarium, Suan Son Beach, and Ao Prao Beach are within close reach of Ao Thian Beach.