Now if I'd been asked this question fifty years ago there would have been no hesitation: Saturday Nights! Now, however, in my late seventies, Saturday night is generally just another stay home and watch television night. Maybe with a glass of red before bedtime.
Now it is definitely Sunday mornings over Saturday nights. My wife and I do our grocery shopping then drive to a favourite coffee shop to have a light snack and a very leisurely cuppacino or flat white. Then, it's off to lunch which, officially would be afternoon, for we don't arrive to eat until a little after midday...I think you get my drift. Sunday is our real day of together time and liesure time.
Oh, and the Sunday morning hangover of old has long passed away.