The splash pad is in the area with the "waves" coming out of the ground. It may still be a little early in the year for it to be activated, so going down to the beach may be a better option. The waves tend to crash over the concrete barriers to create little pools perfect for small children.
From what I can recall the Pascagoula splash pad won't open until May 1st. That was last year though, it may have changed.
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