Who needs a campground? Just pull that rig right up to the front door and run an extension cord to a plug on the wall! Ole George Vanderbilt won't mind!
1. Go when the Christmas decorations are out.
2. Hope this doesn't offend you folks with kids, but this is not a good place for young children because you want to take your time and look at everything and read about each room and all the history involved. With kids, they will become bored very quick. With the price of admission, you need to get your moneys worth. I agree with OC, 2 days, you still won't see it all!