With all due respect, it sounds as if the kids caused much of the initial problem. As another commenter posted below, the staff may not wish to interfere with a child attempting to contact a parent. Additionally, interrupting a parent/child confrontation, such as the young one throwing a fit, isn't always welcome either.

On the other hand, the staff may have been reluctant to page the OP regarding the bathroom accident if she had vocalized frustrations regarding the earlier pages. Regarding the potty accidents, having to deal with multiple children messing their clothes is difficult enough without having to supervise the other children at the same time. The staff probably didn't deliberately let the children slide down the contaminated equipment, but were too busy trying to clean up the other children to be able to prevent a lot of activity. They also cannot examine every child to determine if an irresponsible parent allowed one with pink eye or an ear infection to be exposed to other children.

For someone who emphasized the need to have this trip be a memorable one with her children, the OP seems to be fretting a lot about having to spend time with them.