Three-Day Travel Itinerary for Frankfurt:

Day 1: Exploring the Old Town and Cultural Highlights

Morning:

• Start your day with a hearty German breakfast at a local cafe.
• Head to the Römerberg square in the heart of the old town. Explore the Römer, the historic city hall, and the surrounding half-timbered buildings.
• Visit St. Bartholomew’s Cathedral (Frankfurter Dom) nearby, known for its stunning architecture and panoramic views from the tower.

Afternoon:

• Enjoy a leisurely stroll along the River Main’s promenade, taking in the city’s skyline.
• Visit the Goethe House and Museum, the former residence of the renowned writer Johann Wolfgang von Goethe.
• Have lunch at a traditional German restaurant, trying local dishes like schnitzel or bratwurst.

Evening:

• Explore the Museum Embankment, home to several world-class museums. Consider visiting the Städel Museum for art enthusiasts.
• Enjoy dinner at a cozy restaurant in Sachsenhausen, known for its apple wine (Ebbelwoi) and traditional taverns.

Day 2: Modern Frankfurt and Nature

Morning:

• Start your day at the Main Tower, one of Frankfurt’s tallest skyscrapers. Take the elevator to the observation deck for panoramic views of the city.
• Visit the Palmengarten, a beautiful botanical garden with a wide variety of plants from around the world.

Afternoon:

• Have lunch at a trendy cafe in the Westend district.
• Explore the Senckenberg Natural History Museum, one of the largest natural history museums in Germany.
• Walk through the financial district and marvel at the modern architecture, including the European Central Bank.

Evening:

• Enjoy dinner at a restaurant in the Bahnhofsviertel district, known for its diverse international cuisine.
• If you’re interested in nightlife, explore some of Frankfurt’s bars and clubs, especially around the Bahnhofsviertel and Ostend areas.

Day 3: Day Trip to Nearby Attractions

Morning:

• Take a day trip to Heidelberg, a picturesque town about an hour away by train. Explore the stunning Heidelberg Castle, walk along the charming old town’s streets, and enjoy the views of the Neckar River.

Afternoon:

• Have lunch at a traditional German restaurant in Heidelberg.
• Visit the Philosophers’ Walk for scenic views of the town and the river.
• Return to Frankfurt in the late afternoon.

Evening:

• Spend your last evening shopping and wandering around Zeil, Frankfurt’s main shopping street.
• Enjoy a farewell dinner at a restaurant of your choice, perhaps trying a fusion of international cuisines.

Remember that this itinerary is just a suggestion and can be adjusted based on your preferences and the opening hours of attractions. Also, check ahead of time for any COVID-19 related travel restrictions or changes in operating hours for the mentioned places.