Unless your kayak is a registered vessel I don't see how it will be possible. You might get away with just doing it if you are a HKPR, afaik it's not illegal to just cross outside an official border crossing and they can't turn you back if you are PR. Not sure non-motorized vessels are even allowed in the Chinese part of the Pearl River Delta, there is a hell of a lot of traffic.No vessel is allowed to enter Hong Kong waters without the permission of the Director of Marine. Not less than 24 hours prior to entering into Hong Kong waters, masters/owners/agents of visiting yachts/pleasure vessels shall apply in writing for permission by providing a Pre-Arrival Notification (PAN) to the Marine