Biggest foresty park in London! Great escape from ...

Biggest foresty park in London! Great escape from the busy streets if you are just using local transport or bycicle.
Lot's of areas with beautiful trees and good perspective on London panorama from the Parliament hill.

It has 3 ponds, which are open entire year: male, female and mixed. If there's no other choice, great way to spend a hot day. But be adviced, even though they are separated by gender - you'd have to share it with local birds (and other wild animals). Water is also standing (i.e. no rivers to bring fresh and take old).