Assuming you're looking for a neutral and respectful approach, I'll suggest a few options:
Clare shifted again, the plastic of her lounger creaking. “God, it’s hot.”
“Let it go, Helen,” drawled a voice from the lounge chair to her right. This was Bree, the middle daughter. She was reading a paperback, her sunglasses hiding eyes that missed nothing. “They’re just happy. Or drunk. Probably both.”
This paper could investigate how language is used in a beach setting, focusing on families with children. You could explore:
Portia stood there for a moment, the water dripping from her elbows onto the dry, hot sand. The silence stretched, thin and tight. Then, she dropped the shell. It landed with a wet plap.