This weekend is a holiday weekend, with Martin Luther King Jr. Day following Monday. As such, admission to the national parks is free – if you can get there. Yellowstone can be accessed by car through the northern entrances, but the remainder of the park requires visitors to contract with an outfitter for snowcoach or snowmobile access. The free weekend at both Yellowstone and Grand Teton National Parks includes Saturday through Monday. In Yellowstone, the hotel, dining room and gift shop, Yellowstone General Store, medical clinic, campground, post office, 24-hour gasoline pumps and the Albright Visitor Center are open at Mammoth Hot Springs; while the Old Faithful Snow Lodge and Cabins and the dining room, the Geyser Grill, the Bear Den Gift Shop and the Old Faithful Visitor Education Center are all open for the winter season in the Old Faithful area of the park. In Grand Teton National Park, visitors can enjoy activities ranging from cross-country skiing, skate skiing, and snow shoeing to wildlife viewing and scenic photography. Ranger-led snowshoe hikes are also available from the visitor center in Moose each day at 1:50 pm.