When you leave the State Park go back to the left like you are going to the dam and go back up into State Park Cove you will be heading East. Go back up into the cove until you find the last little pocket with telephone posts on the right side or south side of the cove, once you get about in the middle of that cove turn back to the North and drive straight to the water tower at the State Park and drive straight towards it, watch your depth finder you will bottom out in the middle of the channel at about 35' or more and when you cross over the brush pile throw out your anchor and maybe a marker bouy. Its a very large brush pile and I have caught plenty of crappie on it using minnows.
The brush pile is marked up on some of the lake maps, but that is the easiest way that I can explain how to find it. It will end up being on the the north side of the dead middle of the cove.
If that doesn't produce. Just troll with crank baits and rattle traps in that cove and every time you catch a sandbass take note of the depth and location, you will establish a pattern and the kids won't be 100% too bored.