Presents as soon as he comes down and he can eat anything he wants from his stocking, we do brunch about 11 when things have settled own a bit. I have a standing brunch invitation which i put out to any family or friends who fancy joining us as it's a good way of catching up with lots of people without interfering with anyones lunch/dinner plans.
We were always allowed to 'sneak' down on Christmas morning and discover our gifts by ourselves, very exciting, then we'd race up to mum and dad to tell them what we'd gotten. It was always very relaxed and informal and i loved it.