Hong Kong Godfather - Leung Kar-yan (1985) - Trio Beach Fishing Ground, Sai Kung

Following the utter decimation of their ranks, the three remaining gangsters: Mad Wei (Leung Kar-yan), Playboy Lung (Norman Tsui) and Sergeant Lam (Cheung Kuen) retreat to a hideout located in a fish cultivation farm next to Hebe Haven. On Google Maps it's marked as the Trio Beach Fishing Ground. You can see Trio Beach in the background left of the top image. The current farm isn't quite as extensive as the one you see on film.

Shelter Island in the background