A really big, brand new, never been touched by anyone else Lego set (preferences would be the fishing shack or diagon alley) plus peace and quiet to build it (it wouldn’t be a waste of money because I could sell it on for virtually the price I paid for it).
I have all the material things I want/need, I have good company so the only thing I would ask for is another year of Mrs B. doing ok, and as an afterthought, good health to the rest of us here.
We wish all on AB a Merry Christmas and Happy New Year.