I love Saturdays. It's the only day of the week that I don't HAVE to do anything or go anywhere. I'm fiercely protective of my no-plan Saturdays. If you give me the option of going somewhere on a Friday or a Saturday night, ten times out of ten I'll pick Friday.
Just because I don't make plans for Saturday doesn't mean that I always sit at home and veg all day. We often go to matinee movies or out to dinner. But it's not unheard of for me to not leave the house on a Saturday. I get a lot of good reading done on Saturdays.
Saturdays are my favorite.