premise: A multitude of people in swim-wear play in the water in front of a white wall while people behind a row of bicycles look on. hypothesis: A group of people play in a public wave-pool, while people who couldn't afford the fee have to watch.
neutral: We have no way of knowing if the place is a public wave pool or if its a pool at all. It could be a lake or the beach. And just because people on bicycles are watching doesn't mean the only reason they are watching is they are people who couldn't afford the fee to get in. They could just be gathered to watch and not want to actually swim.