My wife and I made this trip last year and it was fun. The hiking trails are very nice and you can get a map at the CFall's info shed there at the Falls. The lodge has a wonderful buffet breakfast every morning that I recommend. I waded and fished above the Falls even though you aren't suppose to via the signs. It had been very dry and the water was very low, heck most places I waded were only knee deep with an occassional pool that had depth.I caught some decent Smallmouth doing this on a few different baits.
Now below the Falls they allow bank and wade fishing but this area can be a bit tough, large boulders and rough terrain but some places aren't too bad. I did not fish there but heard it can be very good. It is a beautiful place and I hope you and your Son have a great and safe time.