Well I fished the boat slip area as a kid up until I moved to the Irish Hills area in 05. The fishing was never that good do to it being over fished. But I can say that I've pulled some nice perch out of there when the traffic was slow. Minnows are always a good choice for Perch.
You should visit the Bottom Line bait store before you fish. Ask for Bill or Jeff (their the owners) they know the in's and out's and the what's what in the hole area.
If you have the time before you leave the park visit the nature center and take a look-see. I've gone there a million times as a kid and it never gets old. Let us know hoe you do.
Keep the fish fooled,
-Jeff-