The channel isn't too friendly to walk, I would suggest going to Bluff Landing if you want to fish the Channel. This is a large oxbow right off the channel and there's easy walking on the shoreline/campground area's of Bluff Landing. To get there take 71st/Kenosha 12 miles East from the BA Expressway and 71st. You could also try fishing on the Lock and Dam at Bluegill point. There's a small area that you can cast down below the spillway area of the Lock and Dam but you might have other fisherman there and there's not too much room. You could also walk down and fish below but it might be more walking than you want, while taking your son.