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Stay near the areas you'll keep coming back to. South Kensington and the South Bank can fill several easy days, and we note step-free routes for buggies.

A day-by-day route for a four-year-old and a ten-year-old, with one main outing each full day and a recovery day built in.

Pick your hotel by train station first. Keep each day to one part of the city, go gently after the long flight, and know where to duck inside when it rains.

LA is huge, so plan one area per day. Stay near what you most want to see, and check the drive time before you cross the city.

The zoo, Safari Park and beaches sit far apart. Give each big day its own area, follow it with an easy beach or park day, and stay where you'll spend the most time.

Beach time is the main event here. Check surf conditions each morning, and save the island drive for one day rather than every day.

Build each day around one area: Sagrada Família, Ciutadella, Montjuïc, Park Güell or the beach. Leave room for shade, playgrounds and a swim.

Lisbon is steep. Decide early whether you want a flatter base or a hillside one, then give Belém, Parque das Nações, Baixa and Alfama a day each.

Getting around is easy; the heat and afternoon rain are what to plan for. Choose the city or Sentosa as your base, and follow each big outing with a pool or air-conditioned break.

Copenhagen's playgrounds are worth planning for. Stay central for convenience or in a calmer neighbourhood, and pair each big outing with time to run around.

One big ancient site a day is plenty. Mix the history with Villa Borghese, the Explora children's museum and slow afternoons in the piazzas.

Follow a museum morning with an afternoon outside. Retiro and Madrid Río are worth planning around, not just squeezing in.

Pair one museum with time in Vondelpark or on a canal or ferry. Cycling is famous here, but walking and trams suit many families better.

Plan around the harbour. Give Taronga Zoo, Manly, the beaches and the Blue Mountains their own days, and check the weather before water outings.

Downtown and Stanley Park fit together nicely. Save the North Shore mountains for a clear day and decide on the morning.

The CN Tower, aquarium and Harbourfront make one easy day. Keep the Toronto Islands for a fine day, and check step-free TTC routes if you have a buggy.

Heat and distance shape every day. Keep Downtown, the beaches, old Dubai and the theme parks on separate days, and plan pool time as part of the trip.

Give Hong Kong Island, Kowloon and Lantau a day each. Ferries and trams are half the fun, and a cool break helps with the heat and crowds.

Use the river boats and Skytrain to get around. Keep temple visits short for children, and plan a cool indoor stop into each day.

Plan one district per day: palaces, the river parks, shopping or theme parks. Older children can help choose, especially for K-pop and food.

Pair one cultural highlight with space to move. Vienna’s transit makes it easy to balance museums and palaces with parks, rides and play.