London

Here's a suggested itinerary for 6 days in London:

Day 1: Arrival and Exploring the City

• Arrive in London and check into your hotel
• Take a stroll around the city to get your bearings and explore some of the iconic landmarks such as Big Ben, Westminster Abbey, and the Houses of Parliament.
• Visit the British Museum to see some of the world's most famous artifacts, including the Rosetta Stone and the Elgin Marbles.

Day 2: Royal London

• Start your day with a visit to Buckingham Palace to watch the Changing of the Guard ceremony.
• Head over to Kensington Palace to learn about the history of the royal family and see the beautiful gardens.
• In the afternoon, take a tour of the Tower of London to see the Crown Jewels and learn about the history of the tower.

Day 3: Art and Culture

• Spend the morning at the Tate Modern, one of the world's most famous modern art museums.
• After lunch, head over to the National Gallery to see some of the world's most famous paintings, including works by Van Gogh, Monet, and Botticelli.
• In the evening, catch a show in London's West End theater district.

Day 4: Shopping and Markets

• Start your day with a visit to the famous Harrods department store for some luxury shopping.
• Head over to Camden Market to browse unique clothing, jewelry, and food stalls.
• Finish off the day with a visit to Covent Garden, where you can find street performers, boutique shops, and restaurants.

Day 5: Parks and Gardens

• Spend the morning exploring Hyde Park, one of London's largest parks, and visit the Serpentine Gallery.
• In the afternoon, head over to Kew Gardens to see the beautiful botanical gardens and greenhouses.
• Finish off the day with a sunset walk along the Thames River.

Day 6: Day Trip to Oxford

• Take a day trip to the historic university town of Oxford, just an hour's train ride from London.
• Visit some of the famous colleges and libraries, including Christ Church College and the Bodleian Library.
• Enjoy a traditional English afternoon tea before heading back to London for your final evening in the city.

I hope this itinerary gives you a good idea of what to do during your 6 days in London. Of course, there are many other things to see and do in the city, so feel free to customize your itinerary based on your interests!