Mr beh, you might want to visit the great wall and the Gu gong. Brace yourselves for a unusually chilly Beijing as the temperatures willdrop quite low

Hi, apart from warm clothes, you also need to bring some moisturizer skincare cosmetics and drink more water since it is dry in Beijing at that time. It may be windy and you need to bring windproof garments. Well, the temperature may be differ much day and night, and the road may freezes in the morning, you need to bring antiskid shoes. Addition,be careful of catching a cold.
To have a general understanding of China rich history and culture, you may go to visit the Forbidden City, Temple of Confucius , Temple of Heaven, Capital Museum, and Beijing Hutongs. Well, for more interesting places, you can refer to Beijing Tour Packages(https://www.travelchinaguide.com/package/beijing.htm) to make you itinerary in Beijing.
Wish you a good time in Beijing!