Here's an ideal itinerary for 3 days in Geneva:

Day 1:

• Start your day with a visit to the iconic Jet d'Eau, one of Geneva's most famous landmarks.
• Next, head over to the Old Town and explore its charming cobblestone streets, historic buildings, and picturesque squares. Don't miss the St. Pierre Cathedral, which offers stunning views of the city from its towers.
• For lunch, try some traditional Swiss cuisine at a local restaurant. Cheese fondue or raclette are must-tries!
• In the afternoon, take a stroll along the shores of Lake Geneva and enjoy the beautiful scenery. You can also visit the Flower Clock, a popular attraction that features a clock face made entirely of flowers.
• End your day with a relaxing boat cruise on the lake, where you can admire the city from a different perspective.

Day 2:

• Start your day with a visit to the United Nations headquarters, located in Geneva. Take a guided tour to learn more about the organization's work and history.
• Next, head over to the International Red Cross and Red Crescent Museum, which offers fascinating insights into the humanitarian work of these organizations.
• For lunch, grab a bite at one of the many food trucks or street vendors in the trendy Plainpalais neighborhood.
• In the afternoon, visit the Patek Philippe Museum, which showcases the history of watchmaking in Switzerland.
• End your day with a visit to Carouge, a charming neighborhood known for its Italian-inspired architecture, artisanal shops, and lively nightlife.

Day 3:

• Start your day with a visit to the CERN particle physics laboratory, located just outside of Geneva. Take a guided tour to learn more about the cutting-edge research being conducted here.
• Next, head over to the Botanical Gardens, which offer a peaceful oasis in the heart of the city.
• For lunch, try some delicious Swiss chocolate at one of the many chocolatiers in town.
• In the afternoon, visit the Museum of Art and History, which features an impressive collection of art and artifacts from around the world.
• End your day with a visit to the Bains des Pâquis, a popular spot for swimming, sunbathing, and enjoying the beautiful views of Lake Geneva.