I've a few hundred Recipe Books, as loved perusing them for ideas for entertaining, of which I did much, for about 25 years!
Probably my favourite would be the very original 'Margaret Fulton Cookbook', which I think was re-printed about 6 months' ago.
For relaxation, I would read through my books! Latest I've bought is Jamie Oliver's 'Comfort Food' one.
These will all be handed onto my son, as he's a Chef! (Wonder from whom he got the 'inspiration' for that as a career? Lol!)