going to water park!!

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hello friends, I am going to water park on sunday which is just 2 hour away from my city.....but I have no idea what to do in water park...as this is my first time to visit a water park.....I have so many question in my mind.....For example, What should i need to pack for going like clothes, money, mobile etc....do water park organisers will provide some clothes to wear for rides?? if I am on ride, then who is going to click my pics?? is mobile allowed to take with us while on ride??? should I need to take some extra clothes with myself...as my clothes will get wet....??? please help me out....Going on sunday....