Per the website "Check-in time begins at 4 p.m. or as rooms become available. However, you are welcome to play in the water park as early as 1 p.m. Check-out time is 11:00 a.m. As our guest, please feel free to enjoy the water park facilities until closing. " Extended check out will depend on availability and who you deal with.
Check in is usually at 3. If you are lucky, and it's slow, you may get to check in at 1.. atleast that's been my experience
Check in starts at 1. Check out is 11am but can be extended for a fee. You can use the water park all day on check out day regardless of the time. They have showers in the pool area.
Thanks! Your answer is awaiting moderation.