You can, for instance visit the Tower of London, the Houses of Parliament, the National Gallery, the Zoological Gardens, the various Parks, the Museums at South Kensington, Madame Tussaud's Exhibition of Waxworks, or the Botanical Gardens at Kew.

You can go to Kew by river steamer--and this is the way that the children would have gone if they had gone at all.

Only they never did, because it was when they were discussing the arrangements for the journey, and what they should take with them to eat and how much of it, and what the whole thing would cost, that the adventure of the Little Black Girl began to happen.
The children were sitting on a seat in St James's Park.

They had been watching the pelican repulsing with careful dignity the advances of the seagulls who are always so anxious to play games with it.

The pelican thinks, very properly, that it hasn't the figure for games, so it spends most of its time pretending that that is not the reason why it won't play.
The breathlessness caused by Atlantis was wearing off a little.