We were just there this week. The indoor water park opens at 9 am. The outside parts open at 10 am. They allowed us to enter on our first day at 11:00 am.
The website states that you can get access to the park at 1pm on the day of your checkin but we were able to go right after we checked in (check-in starts at 11:30.). On subsequent days, you have access to the park when it opens at 9 a.m.
10 am. Indoor and outdoor
9 am... it's all inside.
1 pm
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