Easy first-morning option: use your hotel's breakfast or pop into a local bakery chain such as Gail's or Pret for pastries and coffee to recover from travel.
A gentle first sightseeing walk to see the Palace of Westminster and iconic Elizabeth Tower from outside — a perfect orientation to London and quick photos.
Historic coronation and royal wedding church with spectacular medieval and Victorian architecture; book tickets in advance to guarantee entry and skip lines.
Relaxed riverside walk toward the Millennium Bridge with a visit to Tate Modern's free collections — good for stretching legs and modern art viewing (open ~10:00–18:00).
World-class collection of antiquities including the Rosetta Stone and Elgin Marbles; no ticket cost but allow 2 hours for highlights (museum opens ~10:00).
Hoppers offers Sri Lankan-influenced dishes the whole family can enjoy; Dishoom in Carnaby/Soho is an alternative for classic Bombay-style plates—reserve ahead.
Dinosaur skeletons and interactive family galleries make this museum a highlight for children; no ticket cost for general admission but special exhibitions may charge.
Gymkhana is an excellent, family-friendly Indian restaurant (highly recommended to reserve); choose a more casual pub alternative if you prefer quicker service.
Take a 30–60 minute train to Windsor to tour Windsor Castle — the State Apartments and St George's Chapel are highlights; book tickets in advance (and check Changing the Guard times).
Stroll the charming streets of Windsor and cross into Eton for antique shops and riverside views — a relaxed end to your trip if you depart later in the day.
If you remain in London for one last evening, choose a family-friendly spot near your hotel; otherwise dine at the airport or station before departure.