High-Speed Thames River RIB Cruise in London. Let your adrenaline levels go through the roof during a 50-minute white-knuckle ride on the Thames River. Climb aboard a modern RIB (rigid-inflatable-boat) and satisfy an appetite for adventure as you soar past iconic landmarks like Big Ben, St Paul’s Cathedral and the London Eye. Enrich your knowledge of English history as you listen to illuminating onboard commentary, and experience the exhilaration of super-fast speeds up to 35 miles (56 km). Enjoy an intimate atmosphere on this small-group tour, limited to 12 people. Special Offer ! High-Speed Thames River RIB Cruise in London From $46.70.