Website mentions 12pm-5:30pm Sun-Fri, and until 6:00pm on Saturday. You may need to call ahead to see if that is when the last entry is.
5, I think
Between 5 and 6 pm
Splash water kingdom closes at 5:30pm everyday and I believe the rest of the park was 6pm.
Sun to Fri 5:30pm and sat 6pm
I'm Not sure but we were there until 7 pm and they were still open when we left
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