The winter season gets under way in Yellowstone National Park Sunday, beginning at 7:00 am when visitors will first be able to travel to the park’s interior roads this season on commercially-guided snowmobiles or snowcoaches. Spokesman Al Nash says the Geyser Grill, the Bear Den Gift Shop, and the Old Faithful Visitor Education Center at the Old Faithful Area open for the season on Sunday while the Old Faithful Snow Lodge and Cabins and the Obsidian Dining Room open on December 18th. The Mammoth Hot Springs Hotel, dining room and gift shop will open for the season on December 20th. Meanwhile, the Yellowstone General Store, the medical clinic, campground, post office and the Albright Visitor Center at Mammoth Hot Springs are open all year, as are the 24-hour gasoline pumps at Mammoth Hot Springs and Tower Junction. Nash says visitors should come prepared by carrying personal emergency survival equipment and dressing appropriately for outside activities in extremely cold weather.