It's interesting that today would be called a day "off" for many people across the country. It is a day to honor and remember a great man, Dr. Martin Luther King, Jr. The day is not "off" for many of us, especially those of us stay-at-home parents. I would rather call it a day "different."
The kids don't have school. My wife doesn't have to go in to work. But the day is far from "off." Still doing laundry. Still cleaning up after breakfast. Still making sure the kids don't kill one another and are at least fairly well entertained without turning an electronic device on every frew minutes. Still thinking about what's for dinner. And still working on how to make sure bed-time isn't a complete disaster without my wife around.
Either way, it's nice not to have to get the kids to school - and to have the time to spend with the entire family. I'll take the day "different" - even if others may actually have the day "off." :)