When it comes to beaches in Hong Kong, Sai Kung is defintiely the place to be.

Here are my top 5:
1) Long Ke
2) Big Wave Sai Wan
3) Sharp Island
4) Half Moon Bay
5) Hoi Ha

More information on how to get to the beaches:
http://www.laughtraveleat.com/asia/sa...
If you want a full guide to Sai Kung:
https://www.laughtraveleat.com/hong-k...