My dds are 4.5 and just turned 1. My plans for next week are:
Monday: Museum
Tuesday: Soft play with friend (so I can have a chat with the other mum while the kids look after themselves play together)
Wednesday: DH is home so I think we'll go further afield...maybe a visit to Bath markets.
Thursday: Ballet show with dd1 while dd2 stays with my mum. I plan to get dd1 to buy some token gifts for the family after the ballet, but that will depend on how mental town is.
Friday: PJ day with lots of baking, cooking, making of decorations, and finally dvds...as many as they can watch without going cross-eyed 
Saturday: DH home (yay!) and Christmas Eve (yay!!). Nothing planned...we'll go with the flow.
This is the first time that I have the whole week before Christmas to spend at home, so I'm really looking forward to it. I was home last year, but dd2 was a newborn premmie and things were just too too stressful and not festive at all.
Being pregnant with older children at home is the hardest thing imaginable. Can you rope in some help? Send the kids to a friend's house for a while? Or call someone over to yours so the children can play while you have some company?