3:45–4:00 PM – Hotel pick-up in Cat Ba Town → transfer to Beo Harbor; board our escort boat to a quiet cove in Lan Ha Bay (Van Boi area). 4:30–6:00 PM – Sunset swim at the beach area and free time to relax on deck. Your guide/crew prepares a Vietnamese dinner set menu on board (vegetarian available). 6:15–9:00 PM – At a floating house, receive a safety & eco briefing; gear up with life jacket, paddle & headlamp. Enjoy a guided night-kayak through calm lagoons where you can witness the bioluminescent glow of plankton (best on low-moon nights). Quiet paddling, stargazing photo stops. Return to Beo Harbor; vehicle transfer back to your hotel. Note: Exact route/stop may change with weather & park regulations. No touching/collecting marine life; we follow Leave-No-Trace.