I used to live in London and for a sunny day I highly recommend the Fountain Court of Somerset House on The Strand near Waterloo Bridge. It’s free to go into the Fountain Court – it’s a big courtyard of a historic building next to the Thames and has a load of jet fountains sunk into the ground that do a little dance every half hour (and a bigger dance three times a day). It’s fun to watch the kids running around in it and it’s good to walk through yourself – just don’t get caught out when the jets suddenly shoot up ten feet in the air! You can sit around at tables in the courtyard drinking coffee and relaxing. Very quiet, very peaceful, but right in the heart of London.
Enjoy! You all deserve a lovely holiday!