In an annual rite of fall, Acadia National Park is closing one of its visitor centers and its Sand Beach entrance station as the cold-weather season arrives. Park officials say the Sand Beach station and the Hulls Cove Visitor Center are closing Wednesday for the season. Park information will be available during the winter at the winter visitor center at park headquarters. The park’s popular Park Loop Road is slated to close on Dec. 1, unless a snowstorm forces an earlier closure. But the park will leave open two miles of Park Loop Road from Schooner Head overlook to Otter Cliff Road.