We usually spend Boxing Day at my sister's house where we have a smaller Christmas dinner and play various card games/video games etc. I'm not sure if it'll be happening this year as with two new babies in the family plus two new partners there would be sixteen of us and her house isn't that big!
If we are no longer doing this i think I'd like to have a wee family day just the four of us with a mini Christmas dinner, movies, playing games and, if the weather is dry, a long walk with the dog. (We see all family on our rather hectic Christmas day) Growing up, Christmas was always about a couple of lazy days spent in comfy clothes, eating tasty food and playing with our new presents. I'd be interested to hear what other people get up to on Boxing Day too. Any good traditions?