I would plan a nice nut roast and trimmings for one, a mince pie, and a glass of wine, all prepped beforehand and a timetable for the day, with a morning and afternoon walk planned, listen to some music in the morning with some nice coffee, and then the rest of the day spent quietly watching a film or box set of my choice, and maybe read a nice book in a comfy armchair, make a few calls, and have a nice hot bubble bath at bed time and would relish the me time and the lack of clearing up.
Currently I'm still chief cook ( and food shopper) for the family of 10 guests including ex husband ( and at the ex matrimonial home) on both Christmas day and boxing day and dream having of one on my own, where perhaps other family members would just pop over to my little house for a mince pie and cup of tea in the afternoon..
That's not to say I would feel them same if it were the first Christmas after a family bereavement but I would appreciate the rest rather than the stress of it all.