Mine were:
Getting the radio times and highlighting everything I wanted to watch.
Decorating the tree and putting the presents around it while checking the labels to see which were for me!
Christmas Eve sitting in front of the fire with my sister watching tv while our parents did last minute preparation, then opening a present after midnight mass (a teenage happy memory).
As a younger child, being allowed the portable tv in my room on Christmas Eve so I could watch early morning cartoons and not wake anyone. And the best thing, finding my filled stocking (I don't recall remembering Father Christmas, so my memories are knowing it was my parents) and feeling everything in it before going into my parents' room to open it! I never unwrapped anything but used to feel all the gifts!
I also loved handing out the gifts from around the tree.
I still love Christmas, and having young children makes it even more amazing! We stay at home every year so we can do Christmas our way and pass down our happy memories to make new traditions with them.