In no particular order:

• St Paul's Cathedral - visit the cathedral and climb the dome for spectacular views over London.

• Windsor - walk around the town and to the side of the castle to see the start of the Great Park.

• Walking from Westminster, through St James's Park, to Buckingham Palace.

• Hampton Court Palace - visit inside and walk around the gardens.

• London Transport (external link) river boat from Westminster Pier, around the Thames Barrier and back to Greenwich. Climb the hill to the Royal Observatory, then Docklands Light Railway to Bank via Canary Wharf.

• British Museum - including the refurbished Great Court.

• National Portrait Gallery and National Gallery.

• A visit to the Houses of Parliament - (external link - see "attending the evening sittings").