Sure, I'd be happy to help you plan your 3-day itinerary in Chiang Mai! Here's a sample itinerary that will give you a taste of the city's culture, history, and natural beauty:

Day 1:

• Start your day with a visit to Wat Phra That Doi Suthep, one of the most famous temples in Chiang Mai. It's located on top of a mountain, so you'll need to take a songthaew (red truck) or a taxi to get there. The temple is known for its stunning views of the city and its golden chedi.
• After visiting the temple, head back down the mountain and stop at the Bhubing Palace Gardens. This beautiful botanical garden is home to a variety of flowers and plants, as well as a royal residence that's occasionally used by the Thai royal family.
• In the afternoon, explore the Old City of Chiang Mai. You can rent a bicycle or walk around the moat that surrounds the city center. Visit some of the many temples in the area, such as Wat Chedi Luang or Wat Phra Singh. Don't forget to try some street food along the way!

Day 2:

• Take a cooking class to learn how to make some of Thailand's most famous dishes. There are many cooking schools in Chiang Mai that offer half-day or full-day classes. You'll get to visit a local market, learn about Thai ingredients, and cook several dishes that you can enjoy for lunch.
• After lunch, visit the Elephant Nature Park, a sanctuary for rescued elephants. You'll have the opportunity to feed and bathe the elephants, and learn about their history and behavior. This is a great way to support ethical tourism and learn about Thailand's national animal.

Day 3:

• Start your day with a visit to the Sunday Walking Street Market. This weekly market takes place in the Old City and features local handicrafts, street food, and live music. It's a great place to buy souvenirs and experience the local culture.
• In the afternoon, take a trip to Doi Inthanon National Park, which is about 2 hours from Chiang Mai. This park is home to Thailand's highest mountain, as well as several waterfalls and hiking trails. You can hire a guide or rent a motorbike to explore the park on your own.

I hope this itinerary gives you some ideas for your trip to Chiang Mai! Let me know if you have any questions or need further assistance.