Mount Rainier Guest Services operates two restaurants, two snack bars, a cafe, and a small general store within the park. See Operating Hours and Seasons for current information about these facilities. The National Park Inn at Longmire includes a restaurant that is usually open year round, serving breakfast, lunch, and dinner. This is the only in-park dining facility that is open all year. Restaurants - Mount Rainier National Park (U.S. National Park Service)