Nice job on taking the little guy fishing - hopefully you will have a lifelong fishing partner in the making.
I am trying to get my wife into fishing (my dad too), so I took out the canoe twice last weekend hoping to get her into some sunfish and bass. I was flyfishing, and she was using a ultralight spin outfit. On saturday we caught some beautiful pumpkinseed, yellow perch and some small pickerel. Went to lake Rohunta on Sunday (Route 2 and 202 intersection) and launched at the new public boat ramp. Within my first 5 casts with a size 2 deer hair swimming frog I had a big bass come up and inhale the fly. It didn't fight too hard and I was able to land it. You could have stuck your fist in its mouth. We got a few pictures and sent it on its way. I hadn't fished specifically for largemouth on a fly before, and I too had made it a point to do this year. We have so many small ponds and lakes that IMO offer better fishing than our trout resources - so why not give them a shot. I found the 7wt to be okay, but the bigger wind resistant flies might have done a bit better on the 8wt. It was a blast - my wife loved it and thought it was fun, there are plenty of fish, and there are many areas to check out - often uncrowded areas.