Time Out says
Lying close to China, in the northeast of Plover Cove Country Park, this far-flung island is home to merely a few hundred people. Also known as Crooked Island, thanks to its irregular shape, Kat O was once a thriving fishing village with nearly 300 years of history. Stop by at Kat O Geoheritage Centre – open every Saturday, Sunday, and public holiday – which celebrates the island’s geology and cultural history. You can also take a wander along the Kat O Nature Trail and make your way through the villages before heading upwards and finishing up at a pagoda. Look out for ancient temples, ancestral halls, and corroded cannons along your way.
How to get there: Same as reaching Ap Chau, get on the ferry from Ma Liu Shui Landing No.3 pier and hop off at Kat O. Or, just to be safe, you can always join a local tour.