Here's a sample travel plan for a three-day trip to a new city, focusing on history, food, and nature:

Day 1: History
- Morning: Visit the city's most famous historical landmark or museum. Take a guided tour to learn about the city's past.
- Afternoon: Explore a historical neighborhood, such as the Old Town or a district with well-preserved architecture from a specific era.
- Evening: Dine at a restaurant known for its traditional cuisine, preferably one with a historical ambiance or a story behind it.

Day 2: Food
- Morning: Visit a local farmers market or food hall to sample regional specialties and interact with local vendors.
- Afternoon: Attend a cooking class or food workshop to learn about the city's culinary traditions and techniques.
- Evening: Go on a food tour or a progressive dinner, visiting multiple restaurants or eateries to taste a variety of local dishes.

Day 3: Nature
- Morning: Hike or bike in a nearby natural area, such as a park, forest, or nature reserve, to enjoy the local flora and fauna.
- Afternoon: Visit a botanical garden, zoo, or aquarium to learn about the region's ecosystems and wildlife.
- Evening: Enjoy a picnic or outdoor dining experience in a scenic location, such as a park or waterfront, to appreciate the city's natural beauty.

Remember to adapt this plan based on the specific city you're visiting and the available attractions. Research the destinations in advance, make reservations as needed, and allow some flexibility for spontaneous discoveries or recommendations from locals.