In order to make the most of the Hop on Hop off Bus Tour, it is suggested to make advance bookings and get a 24 hour bus ticket. You can also add a free walking tour and a free river tour to your bus ticket. The bus tour covers 4 zones and more than 60 stops including the Tower of London, Buckingham Palace, Westminster Abbey, Oxford Street & Regent Street, Shakespeare's Globe, St Paul's Cathedral and Trafalgar Square. The bus departs every 5 minutes from main tourist points, and every 15 minutes from elsewhere. Audio guides available in the following languages: English, French, German, Spanish, Italian, Japanese, Portuguese (Brazilian) & Russian.