Taxi
Minicabs are usually cheaper than black cabs. especially in the night or over weekends. But minicabs are unlicensed and are not allowed to pick up customers in the street. Check Yellow Pages or online for minicab firms. If you're going to a train station or airport at odd hours (midnight or early morning), you should book a minicab in advance. Minicabs usually charge a fixed price for most destinations, so ask for a price when you book them.
Do not Blitzkrieg Sights
Understand the history
Walk
For getting from A to B across town, there is usually no faster way. BUT by using the Tube too much you can miss an awful lot. One of the best things about London is the different flavour of the neighbourhoods and how quickly you can move between areas of very different types - the City and Spitalfields, for example; or Bloomsbury, Mayfair and Soho. If you do all your travelling underground, you miss all that. OK, so London is a very big place, but there are a lot of major attractions you can easily walk between and it will open your eyes. Do not be tempted to get of at Covent Garden station to visit Covent Garden! Nearly all the stations within two stops from it are only a ten minute walk away.
Of particular note are Hampstead Heath - a large slice of countryside in a hilly part of the city, with some stunning views, tube at Hampstead; Regent's Park - a large formal park in the Victorian tradition near to Baker Street, with an excellent open-air theatre; Hyde Park and Kensington Gardens - a huge open space right in the centre of the West End; Wimbledon Common - wild open countryside perfect for cycling, next to a picture perfect "village"; and the myriad tree-lined squares of Bloomsbury and Finsbury.
The beauty of London is the enormous choice of activities that it offers. After a wonderful day of sightseeing, shopping or relaxing, a great night can follow.
Live Music:
Roundhouse, O2 Arena, Wembley Arena, Earl's Court & Olympia, Royal Albert Hall, The Swan, Half Moon, The Windmill