I live in Guangzhou but I go very often to HK to fly there. Because I like it so much and it is easier to fly in HK without hassle and without bystanders
So here is a list of where I flew:
1- South Bay Beach
2- Nam Sang Wai
3- Lamma Island: many spots...
4- Cheung Chau
5- Tai Tam
6- Turtle Cove
7- Sai Kung:Tai Wan and Tung Wan; Ham Tin and Sai Wan
8- Chung Hom Kok Beach
9- Big Wave Beach.
My favourite spot ? I would rather say Sai Kung (though lots of hiking needed). Otherwise: Cheung Chau.