The Original London Sightseeing Tour: Hop-on Hop-off. The flexible and open-dated hop-on hop-off sightseeing tour is a convenient and hassle-free way to see the significant sights of London in family-friendly fashion, with its three routes as well as three transport link services. On the hop-on hop-off bus tour, you can see key landmarks — such as the Tower Bridge, Big Ben, London Eye and Westminster Abbey — while you’re seated comfortably in a roomy double-decker bus with an open top. Included in your hop-on hop-off tour ticket are additional activities, such as three walking tours of London and a Thames River sightseeing cruise. Book Now and Save 13% Off The Original London Sightseeing Tour: Hop-on Hop-off.