To reach Tung Wan beach, the best route to hike is from the youth hostel in 赤徑. There are two ferry services available around 10:30 am and 5 pm. After reaching the beach, hike for an hour to 大灣 and then head north for another 30+ minutes.
There are three other beaches located south of Tung Wan, but it is the most appropriate for overnight camping due to the availability of fresh water and fewer swimmers and yachts. The trail from 赤徑 is steep and challenging, whereas the trail via 大灣 is comparatively easier.
If you are looking for a quick swim, then 大灣 is a better option than Tung Wan. Neither beach has any public facilities, but you can find a few stores in 咸田 and 西灣 located further south.