Rainham Marshes, Essex
2 miles, rspb.org.uk
One of few ancient landscapes remaining in London, these medieval marshes right next to the River Thames are a magical place to wander in winter. Retreat to the hides and the café in between exploring the boardwalks of the RSPB reserve. Look for high drama in the sky with hungry peregrine falcons targeting pigeons, while foxes prowl the grounds.