Upload & Sell: Off
I too have been there a number of times with family. Some thoughts. First, as a dad of two kids myself, be careful that you don't end up making photography the center of attention rather than the family. You don't want to have your kid end up feeling that the camera is more important than he is. Seriously, don't go overboard here. As for camera gear, I think the perfect choice is something like the Canon G12. You want something compact so it doesn't get in the way. Of the lenses mentioned, I'd go for the 16-85mm VR, only because it's the widest. My last trip there I took a D80 and 18-55mm VR, and a flash. I used the flash a lot, but I'm a flash guy. If I go again, I'll take a point & shoot. There is no way I'd take something like a Nikon 24-70mm. Anyway, bottom line is I suggest being a dad first.
Kent in SD