The best way to view London is from the river and the Thames Clippers river taxi does the job. For £8 you can buy a River Roamer (after 10am weekdays and anytime weekends), and get on and off the boats all day. There is no garbled commentary (that's so common on the leisure boats) and it runs from Millbank (Tate Britain) to O2 at Greenwich stopping at all the usual sights (Tower of London, London Eye, The Globe, Greenwich etc).
The seats are comfortable, all seats have good views and there is a bar serving snacks, coffee, soft drinks, wine and beer at reasonable prices. The boats get busy towards the end of the day, especially travelling east. You may have to wait for the next boat, or make your way home by bus or tube. Even so, if you start early, the River Roamer ticket is good value.
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