今日冬至，要做这些事！

Group 1 - The winter solstice marks the shortest day and longest night of the year, symbolizing a significant transition in yin and yang, with daylight gradually increasing from this point onward [2][3] - Traditional foods associated with the winter solstice include dumplings in the north and tangyuan in the south, representing warmth and family reunion [2][3] - Various regional customs highlight the importance of the winter solstice, such as the hearty breakfast in Lanzhou and the sweet wine in Suzhou, reflecting local cultural significance [3] Group 2 - The Harbin Ice and Snow World, featuring a 19-meter tall snowman, showcases the festive spirit of winter and attracts significant attention [4][6] - Unique winter activities, such as viewing the sunset at the Summer Palace, are limited to the winter solstice period, emphasizing the seasonal beauty [7] - The recent changes in Hainan's free trade port and the arrival of inbound travelers signal economic developments and tourism opportunities in the region [9]