Xi Chong is in Guangdong.
Xichong (sometimes written as 西冲 and sometimes written as 西涌) is a beach and a village about 70 kilometers to the east of Shenzhen. It serves a nice weekend getaway from the city of Shenzhen
Getting to Xichong from Shenzhen by public transit will likely require more than three hours. The easiest method would be to start at the Cuìzhú (翠竹) subway station in Shenzhen and catch the h92旅游专线 bus for about 60 minutes to Dapeng (大鹏中心①). The e11 bus comes roughly every 30 minutes. In Dapeng you can get the m232 bus to the Hesoucun (鹤薮村) bus stop in Xichong. Keep in mind that m232 only runs a few times in the morning and a few times in the evening.
You can also share a car or a van with other travellers (called 平车) from Shenzhen or from Dapeng. If you want a van from Shenzhen, it is recommended to arrange it in advance. However, at the Dapeng bus station there are normally people offering to drive groups of travellers to Xichong for 20-40元 per person. To arrange a van in advance, you can call Mr. Ou at 135-1038-2969 and speak Chinese with him to arrange your travel.
Xichong is quite small and is very walkable. Walking to the beach will cost 13元 which you have to pay at the entryway to the beach area. If you arrange for a surfing lesson from your hotel or hostel it is possible that the staff will take you to the beach on a scooter or a moped, in which case you won't need to pay the 13元.
Flotation devices, swimsuits, and similar toys for the beach are readily available in multiple locations.
Arranging a van for eight people from Xichong to the Yíjǐng (怡景) Subway station in Shenzhen should cost around 320 RMB.
You can also take bus number m232 from hesoucun (鹤薮村) to Dapeng, and then the h92旅游专线 bus to Shenzhen. Keep in mind that m232 only runs a few times in the morning and a few times in the evening.