When you get to the entry booths ask for a lake map, they have a simplified topo map. Then drive over to the boat launch there is a point from the boat launch... walk from the point and start walking to the beach one the other side of the lake. You'll stop about in the middle of the lake. When in the middle of the lake at the point between the two beaches... here is the real trick... Stoney Creek is a flooded creek/river. You want to find the actual creeh channel. The creek channel in the middle should be 15-16 foot deep, the creek bank should be 2 foot shallower. If you can find the bank fish the dropoffs. Also, crappie do not stay on the bottom. Last year I was getting them at 7 foot in 15 feet of water. Jig a minnow from the top down ward to find the depth they are hanging at... once you find one you should have located a school. If you don't use minnows a clown spoon w/beed works too. I also use 1/8 oz. Kastmaster spoons in chrome.
The key to Stoney Creek is finding the original creek channel... I can be productive anywhere on the lake. North damn creek channel is about 5 foot and tappers to the south damn to about 23 foot. I have had the bext luch for all fish at 15 foot. You can get walleye and jumbo perch at bottom, channel cats and crappie at that depth this time of year.
Do you like fishing with bait or lures. If you like lures also try white marabo hair jigs for the crappies, try fast upward 18" lift on the jig then lower it slow. Also, if you have access to a fly shop you might want to pick up some small purle egg-sucking leaches and woolie buggers. I have had good experience with those lures for crappies.
The only other thing I can say is I also do well by the south dam. And do what Walleye said start at the top and work down till you find them. It,s about 23' deep there. But Walleye put you in a good area there.
Also remember the park closes at 8:00 and they will be asking you to leave about 7:45.