Keep-
Less more expensive presents for the children over more cheaper ones,
Going for a long walk then to the pub on Christmas Eve,
Box with batteries, scissors, screw driver, bin bags etc next to the sofa for ready Christmas morning, all small bits, instructions, money and vouchers got put back in the box for sake keeping. Didn't get round to it last year and MIL chucked out £30 and two chargers for toys 
Getting myself ready first. Have often ended up a sweaty mess due to 'just' finishing off loads of jobs before getting ready then running out of time. This year I snuck off for a shower once all the Santa presents were opened.
Money as gifts for nieces and nephews on DH's side, piece of cake to sort and more appreciated.
Spreading out the courses. Starter at 12 main at 2:30, pudding at 6
Going to the supermarket at opening (6am) with DH on 23rd and then having a coffee after. Was really quiet and we got everything we needed.
Lose-
Not preparing food etc ahead of time, thought as it was just us it would be ok but it did take more time than I'd have liked.
Brining the turkey. Complete waste of time couldn't tell the difference at all.
Too much party/buffet food for Christmas Eve, expensive and didn't get eaten.