We ended up taking L to Round Lake. His attention span didn't last long (maybe 30 minutes), but he catch 2 sunny's while we were there. So we were happy. He was a little unsure of the fish, especially the first one. But we got him to touch the second one and he loved reeling in the line.
I had also called a local bait shop, and they recommended Lake Lonely near Saratoga Lake or said we could try by the boat launch on Saratoga Lake also.