The more I think about when I was there, I think it was in October of 2000. I don't know if the discussion boards go back that far. Barry would know.
The water park was closed and there was a Haunted Graveyard walk through in that area. The water park looked like fun and yes, it might be a day and half if you wanted to spend alot of time in that area. I had forgotten about the water park until you mentioned it.
We saw all but the waterski show when we were there. The nighttime and daytime show are different for the Shamu show so be sure to see both. We did not ride the roller coasters so I cannot say if they were good or not. We enjoyed all of the shows there and we saw all of the them except for the water ski show.
You will have fun not matter what you do there. Water, animals, and shows, what could be better.
Just out of curiosity, are you the Burkhalters from Dalhart or Hereford? Are you related to the daughter who is the OT? We may know each other. I am from Texas also.