To get round London, as a visitor wanting see lots of stuff, it’ll probably work out cheaper to get a weekly travel card. http://www.tfl.gov.uk/tickets/14416.aspx Please read the restrictions on whichever one you decide to get.
Pick up a pocket A-Z, you can get them practically anywhere in London. Some will even list all the sights. I carry one, even though I live in London – it’s a big place.
You’re never more than about 10 minutes away from a tube (underground/subway) station in the centre. If you want to go further afield there’s http://journeyplanner.tfl.gov.uk/use...T2?language=en to work out a route.
Buses are pretty frequent and run all night unlike the tube. Most bus stops will have a map showing which stop to catch the bus you need. At Elephant & Castle, like elsewhere, there is a letter on top of the bus stop pole denoting the stop. There's also a map at most stops giving which letter stop yoi need . It can be confusing if there are a lot of stops like at Elephant & Castle – I’ve spent 20 minutes trying to find the right stop before now. A lot now tell you when the next 10 or so buses will arrive. Buses also tell you each and every stop – it’s a good idea to know which one you need to get off – see journey planner above. They’re done by landmarks or side roads.
It can take time getting around London, so leave yourself plenty of it.