London

Absolutely, I'd be happy to help you plan an exciting 12-day itinerary in London that caters to your preferences and constraints. Let's get started!

Day 1: Arrival in London

• Arrive in London and check into your accommodation
• Take a leisurely stroll around the neighborhood to get a feel for the city
• Enjoy a traditional English pub dinner with your family

Day 2: Explore Covent Garden and West End

• Visit Covent Garden for its street performers, shops, and cafes
• Catch a matinee show in London's famous West End theater district
• Have dinner at a family-friendly restaurant in the area

Day 3: Thames River Cruise and Tower of London

• Take a relaxing Thames River cruise to see iconic landmarks
• Explore the historic Tower of London and learn about its fascinating history
• Enjoy a picnic lunch by the river or grab some street food

Day 4: Notting Hill and Portobello Road Market

• Wander through the colorful streets of Notting Hill
• Visit the bustling Portobello Road Market for antiques and street food
• Have a family picnic in one of the nearby parks

Day 5: Day Trip to Windsor Castle

• Take a day trip to Windsor Castle, the oldest and largest inhabited castle in the world
• Explore the State Apartments and St. George's Chapel
• Enjoy a traditional English afternoon tea in Windsor

Day 6: Camden Market and Regent's Park

• Spend the morning exploring the eclectic Camden Market
• Relax in Regent's Park and visit the London Zoo
• Have a family dinner at one of the park's charming cafes

Day 7: Harry Potter Studio Tour

• Embark on a magical journey at the Warner Bros. Studio Tour - The Making of Harry Potter
• Explore the sets, props, and costumes from the beloved film series
• Enjoy a themed dinner at a Harry Potter-inspired restaurant

Day 8: Greenwich and Cutty Sark

• Visit the historic Greenwich area and see the Royal Observatory
• Explore the Cutty Sark, a famous 19th-century clipper ship
• Have a family picnic in Greenwich Park overlooking the city skyline

Day 9: Borough Market and South Bank

• Wander through Borough Market and sample delicious street food
• Walk along the South Bank of the Thames and enjoy street performers
• Have a family dinner at a riverside restaurant with a view of the city lights

Day 10: Day Trip to Oxford

• Take a day trip to the historic city of Oxford
• Explore the famous colleges, libraries, and gardens
• Enjoy a traditional English pub lunch before heading back to London

Day 11: Shopping in Oxford Street and Regent Street

• Spend the day shopping in the bustling Oxford Street and Regent Street
• Visit Hamleys, the oldest and largest toy store in the world
• Have a family dinner at a cozy restaurant in the area

Day 12: Departure from London

• Enjoy a leisurely breakfast at a local cafe
• Take a final stroll around the neighborhood and pick up any last-minute souvenirs
• Head to the airport for your flight back to Tokyo

I hope this itinerary gives you a good mix of sightseeing, shopping, dining, and family-friendly activities during your 12 days in London. Let me know if you need any more suggestions or modifications!