Looking for something to do this weekend but spent your allowance in December? The National Park Service has you covered. The NPS is waiving fees today through Monday in honor of Dr. Martin Luther King Jr. The winter is a great time to visit your national parks and monuments; crowds are smaller and the vistas are often greater because the foliage is off the trees. Visiting a park off-season makes me feel like a kid getting an extra day off school. The Park Service waives fees several times throughout the year, but keep in mind that many sites never charge for admission. With over 400 to choose from you cannot go wrong.