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I was wondering about the river tours...how long do they take and would I be able to see more than I would on foot?


There are lots of options, the one from Greenwich is good, and yes you probably will see more.

There's some basic info here:

http://www.tfl.gov.uk/river/


Pah! Have the best of both worlds with a Duck Tour:

http://www.londonducktours.co.uk/