Hop-on Hop-off River Pass - Uber Boat by Thames Clippers

The Hop-on Hop-off (1 Day) river boat ticket is perfect for exploring London; valid for all day travel to 24 piers along the Thames between Barking Riverside Pier in the East and Putney Pier in the West. Services run from early in the morning until late at night 7 days a week. 
 
Tickets are valid between Barking Riverside and Putney so you can hop on and off between 24 piers including North Greenwich for The O2, Greenwich, Tower, London Eye (Waterloo), Westminster and Battersea Power Station. Valid all day (for the indicated purchased date) until the end of service to hop on and off, it is ideal for a day of sightseeing and visiting London's sights.