Martin Luther King Jr. Day is a federal holiday in the United States, which means most school-aged kids and those of us lucky enough to have the day off of work are at home today. But that also means there are many things closed for the holiday. If you find yourself at home wanting to go out to do something today, there's good news - parks, campgrounds and trails are open. Parking meters are also not being enforced on MLK Day. Here is a breakdown of what's open and closed on Martin Luther King J