We have the same issue here at work - we used to rely heavily on students to fill our busiest season (May through the beginning of September) but we can't find the numbers that we used to, and those that do work are only available until the end of the first week of August. We get a little over 2 months from most of them, and that's it.
I have very fond memories of swimming at Caledonia as a child. My grandparents had a cabin about 5 miles north of the park up off Rt. 233. We'd have big family gatherings during the summer, and all of us kids were sent down to the pool to work off extra energy. LOL