For reaching destinations in East London, the quiet, driverless Docklands Light Railway (DLR) is a good alternative, with interesting views of the area.
The DLR connects with the Tube network at Bank and Tower Hill stations as well as at Canary Wharf. It goes to London City Airport, the Docklands financial district, and Greenwich, running 5:30 am–12:30 am Monday–Saturday, 7 am–11:30 pm Sunday. The DLR takes Oyster cards and Travelcards, and fares are the same as those on the Tube. A £17 River Rover ticket (£15.30 if booked online) combines one-day DLR travel with hop-on, hop-off travel on City Cruises riverboats between Westminster, Waterloo, Tower, and Greenwich piers.
Transport for London. 0343/222–1234; www.tfl.gov.uk.