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

Day 1:

• Start your day with a visit to the Guadalajara Cathedral, one of the most iconic landmarks in the city.
• After that, head to the nearby Plaza de Armas, a beautiful public square surrounded by historic buildings and street vendors selling local snacks and souvenirs.
• From there, take a short walk to the Hospicio Cabañas, a UNESCO World Heritage Site that houses a stunning collection of murals by the famous Mexican artist Jose Clemente Orozco.
• In the afternoon, explore the trendy neighborhood of Tlaquepaque, known for its colorful streets, artisan markets, and traditional Mexican architecture.
• End your day with a delicious dinner at one of the many restaurants in the area, where you can try some of the best local cuisine.

Day 2:

• Start your day with a visit to the Mercado San Juan de Dios, one of the largest indoor markets in Latin America. Here, you can find everything from fresh produce and spices to handmade crafts and souvenirs.
• After that, head to the nearby Teatro Degollado, a beautiful neoclassical theater that hosts a variety of cultural events throughout the year.
• From there, take a short walk to the Instituto Cultural Cabañas, another UNESCO World Heritage Site that houses a collection of contemporary art and hosts temporary exhibitions.
• In the afternoon, visit the Guadalajara Zoo, home to over 400 species of animals from around the world.
• End your day with a relaxing stroll through the Parque Agua Azul, a beautiful park with fountains, gardens, and walking trails.

Day 3:

• Start your day with a visit to the Museo Regional de Guadalajara, a museum that showcases the history and culture of the region.
• After that, head to the nearby Mercado Libertad, also known as the "San Juan de Dios Market," where you can find a wide variety of local products and souvenirs.
• From there, take a short walk to the Palacio de Gobierno, a historic government building that houses a collection of murals by Orozco.
• In the afternoon, visit the Instituto Cultural de Mexico, a cultural center that hosts a variety of events and exhibitions throughout the year.
• End your day with a visit to the nearby town of Zapopan, known for its beautiful basilica and charming town square. Here, you can also find a variety of local restaurants and shops selling traditional crafts and souvenirs.

I hope this itinerary helps you plan your trip to Guadalajara! Let me know if you have any other questions or need any more recommendations.