Perhaps by now you have thought of something you might enjoy doing, if not dont feel guilty about the lazy day. I think if you really push yourself it often doesnt work out very well, as my day yesterday proved. Back bad, tried to make an effort. Made up some mince which is usually very good, and was rather mediocre, did some extra potatoes to use some for later and managed to burn them, and later went to fry an egg for once and the egg turned out to be bad!! I do think that when you are in the mood to do something, whether it is baking or writing to people, you make a better job of it. Obviously yesterday wasnt my day!! So if something comes to mind that you would enjoy, go for it, but if not have that lazy day and enjoy it