What does one do on a busy beach?

I mean like a busy beach in the summer, crowded, noisy... Loads of people do it quite clearly... But what are they doing for fun? I recently went to a very busy beach on a hot day... It was too noisy to read I didn't feel like just laying in the sun as it was too hot... And gave up and left my friends to go home after 2 hours. They stayed for 4 more and had a great time... totally don't get what's fun
What does one do on a busy beach?
What does one do on a busy beach?
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