There are lots of fun and interesting outdoor things to do in London.
Everything from sightseeing on a real London bus (small cost) to visiting one of the many wonderful open markets and parks.
And if you want to do something a little less ordinary, its free to visit one of the many Victorian cemeteries, sites of historic prisons and famous locations used in film and music.
Forget paying a fortune to go on one of the many organised London siteseeing bus tours. Do it yourself for under a fiver using London's very own transport system.
This self-guided London sightseeing tour will take you past many famous London tourist attractions including Harrods, Madame Tussauds, Kensington Palace, St Pauls, the Tower of London and Big Ben.
Wandering around a London market is a fun way to spend a day. And its free.
There are hundreds of markets to choose from, ranging from local street markets that sell everyday household items through to specialist markets and popular tourist markets.
Whether you want to buy or browse, they are great fun to explore.
Several Victorian cemeteries and pre-Victorian burial grounds still exist within central London. Almost all are free to access.
From Highgate to Nunhead, the cemeteries provide a remarkable glimpse into Victorian London. And the churchyards are pleasant places to stop and rest, especially on warm summer days.
On sunny days, one of the cheapest and most pleasant things to do in London is to relax in one of London's many parks and open spaces.
There are loads in central London - from royal parks such as St James' and Hyde Park to public parks such as Victoria and Southwark - and they are all free to access.
Victorian London was notorious for its prisons and places of correction - the harsh conditions and cruel treatment of prisoners being so vividly described by Dickens.
Though prisons such as Newgate, Bridewell and Horsemonger Lane no longer exist it is possible to visit the sites where they once stood, which will take you into interesting areas of London. All for free, of course.
London is a popular setting in films and has also been featured on the cover of various famous albums.
From the location-setting images of Big Ben in the film, Independence Day, to the famous pedestrian crossing on the cover of the Beatles' Abbey Road album, images of London often appear on screen and in print.
Many of the locations are still as they were when captured on film - and they are free to visit.