Ask about the route, not a photo
The Cat Hai tourism information lists Hang Sang–Hang Toi and other named areas among bay visitor routes. Access to a cave or lagoon depends on the authorised route, tide and conditions, so request the planned paddle location before booking.
Make the paddle comfortable
Check whether the kayak is single or shared, how long you will paddle and whether a guide stays with the group. Wear a correctly sized life jacket, keep a safe distance from boats and protect your phone in a dry bag.
Accept a safe substitute
Low clearance, strong wind or harbour restrictions can close a particular passage. A responsible crew should explain the substitute rather than promising every pictured cave on every departure.
Explore on the map
These map links help you locate a place; check current access before travelling.
