Adult pool goers - what do people even do at the pool?

If I'm an adult who wants to experience splashing around and wading round the pool, but whose swimming capabilities extend as far as doggy paddling to safety and floating on my back - what can I even do to have fun at the pool?

What do you do at the pool?

Bonus round: kind of out of my budget to pay for swimming classes, and available friends & family are nil. :c
But I borrowed a life jacket from a coworker, and could buy cheap floaties or a pool noodle.