Sunday Meditation: Keeping Sunday Holy: What Exactly Does that Mean?

I often wonder whether I keep Sunday well. Oh, we go to Mass, of course. But what about the rest of the day? What makes it different? After all, we almost always go to daily Mass as well. So what should we be doing that sets Sunday apart? We rarely do any shopping and, if at all, it's my husband going to the grocery store because he makes Sunday dinner and isn't good at planning ahead.

I haven't figured out yet how to make Sunday that holy day for the Lord.

How do you keep Sunday holy?