Mentioned by Londonist
A Guide To London's Parks And Green Spaces
"One of London's largest Royal Parks, Hyde Park is home to the vast Serpentine Lake (which you can swim in), the majestic Wellington Arch and even a hidden pet cemetery. With 350 acres to explore, you're spoilt for choice when it comes to picnic spots, and there are three cafes (including a stingray-shaped one) where you can replenish your supplies. Other points of interest include the Diana Memorial Fountain, the Hyde Park Rose Garden, and the Achilles statue, which actor Laurence Olivier once called "the best arse in London"."