Gardens and Outdoor

Hampstead and Kenwood House
Regents and Primrose Hill
The Regent's Canal
Hyde Park and Kensington Gardens
Richmond Park
Marble Hill
Follow London's Hidden Rivers - the Fleet, the Westbourne, etc.
Cycle up the Lea Valley
Cycle up the Grand Union Canal to Rickmansworth or Amersham
Take the Ferry from Tilbury to Gravesend
Walk under the Green Foot Tunnel from Island Gardens to Greenwich