I sometimes work saturdays, but if I do I always take mondays off so still get 2 days off in a row.
I quite like it, because everyones in on a saturday, and actually getting to see your customers does build loyalty more than a simple card through the door, also its better for picking up extra customers from neighbors.
And I always like taking mondays off, I love that. Its a work day, so if you need to get something done on the car/van or need to do something else, you don't feel like you have to cram it into a saturday when some businesses are only open short hours, or not at all.
Not to mention the smug feeling you get strolling around town on a day off while all the office drones are at work with the monday morning blues. You have to enjoy the perks of being self employed!