Mentioned by London City Calling
50 free things to do in London
"Hyde Park is the largest park in central London and another of the capitals important Royal Parks. There are plenty of free things to do in Hyde Park, including taking a stroll through the colourful Rose Garden, visiting the Princess Diana Memorial Fountain (or one of the parks many other statues and memorials), stepping inside the free Serpentine Art Gallery, listening to the speakers at Speakers Corner or sitting beside the large Serpentine Lake to watch the swans and pedalos for a while."