Set out on a thrilling aquatic adventure with a rib tour around the breathtaking white cliffs of dover start with a short safety briefing before boarding the boat and setting off from dover marina learn about the history of dover harbour and see impressive cruise ships and cross channel ferries up close head on out to langdon bay and marvel at areas of natural beauty that can only be seen from the water see the castles hear tales of smuggling and learn about the deal time ball tower sail