London

Here's an ideal itinerary for 3 days in London, tailored to your constraints:

Day 1:

• Start your day with a hearty breakfast at The Breakfast Club in Soho. They have plenty of vegetarian and vegan options, and their pancakes are a must-try!
• After breakfast, head to the British Museum. It's free to enter and has an incredible collection of artifacts from around the world.
• For lunch, grab a falafel wrap from Maoz Vegetarian in Covent Garden. They have a great selection of toppings and sauces.
• In the afternoon, take a stroll through Hyde Park. You can rent a bike or a boat if you're feeling active, or simply relax on one of the many benches.
• For dinner, head to Dishoom in Shoreditch. They serve delicious Indian food in a stylish setting.

Day 2:

• Start your day with a visit to the Tower of London. You can see the Crown Jewels and learn about the history of the tower and its prisoners.
• For lunch, head to Borough Market. There are plenty of vegetarian and vegan options, including falafel wraps, vegan burgers, and fresh salads.
• In the afternoon, take a walk along the South Bank of the Thames. You'll pass by iconic landmarks like the London Eye and Shakespeare's Globe Theatre.
• For dinner, try Mildreds in Soho. They serve vegetarian and vegan comfort food, like mac and cheese and burgers.

Day 3:

• Start your day with a visit to the Tate Modern. It's free to enter and has an impressive collection of modern art.
• For lunch, head to Camden Market. There are plenty of vegetarian and vegan options, including vegan sushi, falafel wraps, and vegan doughnuts.
• In the afternoon, take a tour of the Houses of Parliament. You can learn about the history of British democracy and see the famous Big Ben.
• For dinner, try The Gate in Hammersmith. They serve vegetarian and vegan food with a Mediterranean twist.

I hope this itinerary gives you some inspiration for your trip to London! Let me know if you have any other questions or if there's anything else I can help you with.