No, the bathroom/changing rooms are pretty basic and get borderline filthy throughout the day. Do not plan on showering here. Yes, you can bring your own everything, even a small grill. Think of this place as an upgraded creek, not a water park with facilities. Do not get me wrong, the place is fun, chill, and i totally recommend it, but it is BASIC.
Yes there is a bath house, and they have lots of tables, chairs and sun umbrellas . But I suppose you can bring your own too.
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