My parents didn't really do Christmas . Both are very religious so they celebrate Christmas but the true meaning of it.My mum (when I was a child) said things like "Oh, I wish it was Boxing Day" "I wish I could wake up and it will all be over".
Not that she worked like a dervish , we had a family friend who stayed , then later I did all the cooking.
So I overdo Christmas (in my DH opinion) and I love the cooking and shopping.
For me, the being organised and having it all come together is a huge part of it.
I don't drink and DH and I are vegetarian, so our meals aren't over indulgent.
Last year and hopefully this year we'll have the four of us plus DF,DM,DBro and DSiL for Christmas.
They will go to Church.
I will cook.
I don't go to anyone for Christmas, I need to do it all in my kitchen (not control freakery, I just know I have what I need).
I would never spend Christmas in the sun either.
I would never spend Christmas somewhere that doesn't celebrate it.
So, whatever you want for Christmas, you do. 
TBH, if I was 19/20 I think I'd love to be at home alone providing I had enough food and money.
You will have a gorgeous time with your younger DC. Your older ones I;m sure will phone you (or Skype if you're lucky)
Are you together for New Year?