It would really be helpful to post on your website and have signs up at the front of the park when there is a private party and the park is not open to the public. It would also be nice to not treat your customers like idiots when they don't know that the park is closed to the public since the info on your website says otherwise. We stood in line for 15-20 min only to be made to feel stupid and turned away.
Go to Big Surf. The park is smaller but the employees are actually friendly unlike here at Sunsplash.
Edit: After receiving the comment from the manager, I just want to clear up the fact that yes, part of the park was supposed to be open on the day I visited. I know for a fact other people were turned away as well and you can see angry comments on their Facebook page about this. I attempted to visit just for the waterslide part that was supposed to be open and no one directed me to the correct place. I assume what happened was that there was a different line for this, but when hundreds of people are lining up at the main entrance, we just followed suit (and so did others) and were rudely turned away and not redirected. According to Sunsplash, these were not their employees that turned us away but it is still extremely poor management to not brief those that are representing your company to redirect guests that perhaps may have just been in the wrong line. Sunsplash lost a bunch of business that day because of those "representatives" that turned people away.