The best way to see London's sights and splendor is from the deck of a boat. With this hop-on hop-off pass you can cruise up and down the Thames, alighting at your leisure, for a whole day.The best way to see London's sights and splendor is from the deck of a boat. With this hop-on hop-off pass you can cruise up and down the Thames, alighting at your leisure, for a whole day.