I dont mean to sound negative but I would never go there again if my life depended on it. Its about a 340 acre lake with tons of fishing pressure. Its very hard on most days to even catch just one fish.
I would suggest taking him to Elmer Davis Lake. Its not too far away and there is a ton of bass in it. This time of year is great for catching some of those big ones you hear about.
Just google it to get directions. I live in louisville and it only takes me about 40 minutes or so to get there. Your son will have a blast if the conditions are right. Much better time than guist creek any day.