There will be 40 free walks throughout the weekend, all led by professional tour guides and with no booking required. You can decide whether to take part in a short stroll or a challenging track, whether to discover the city's hidden places or look at famous landmarks from a different perspective.
There's a huge list of walks to choose from, so we selected a few for each day:
Saturday 27 September
London's Hidden Alleyways and Courtyards: Starting from the steps of St Paul's, this walk explores the capital's past including a monastery, secret alleyways and the history of newspapers and journalism. The walk is two miles long and starts at 11am.
Walking (on water) — The Glorious Lea Valley: Walk from Tottenham Hale to Three Mills over a 5.5 mile route. There will be only one road to cross as you walk through Walthamstow Marshes, Hackney Marshes, the Olympic Park and a grade one listed tidal mill. This walk starts at 11am from Tottenham Hale Station.
Secret Diaries and Public Spaces: This walk explores the aftermath of the hugely destructive Great Fire of London in 1666. See places described by Samuel Pepys in his famous diaries and the legacy of architect Sir Christopher Wren. Meeting is point is outside Aldgate tube station, walk starts at 3.30pm and is 1.5 miles long.
Sunday 28 September
Regent's Canal — Angel to Hackney Wick: Starting from Angel tube station at 12.30pm, this walk covers five miles and links all the London Olympic venues.
A Walk through Historic Bloomsbury: Meet under statue of Newton inside the British Library courtyard and take a 1.5 mile walk through several beautiful Georgian squares before finishing in Russell Square. The walk starts at 2pm.
Gleaming Spires: Learn more about the architecture and public art in the City of London, admiring its ever changing skyline. The walk starts at 3.30pm from Bank tube station.
All walks start and end within Walk London's seven main walking routes: Capital Ring, Green Chain, Jubilee Greenway, Jubilee Walkway, Lea Valley, London Outer Orbital Path (LOOP) and Thames Path. There's still plenty to choose from, so take a look at the website and make up your mind. It would be a shame to miss the chance.