Don't stay in the Waterman's. That place is an overpriced bad joke. Even if you stay there you are not allowed to use their launch site unless you take lessons. Very frustrating.
Take your Mom to Ocracoke for a day-trip. It is a magical place.
You don't have to take lessons there. Just go in the shop, get the armband, and ride. I stayed there and loved it. As far as price...I thought it was very fair for the amenities. The noise was not an issue at all. You can ask to stay in one of the units on the north side away from Mojo's if you want. Check to see what night the bands play...I think it is Thursday. With two little kids to worry about, we had no noise issues, and we were right next to Mojo's. We will definitely go back. Good luck.