Here's an ideal itinerary for 5 days in Thailand:

Day 1: Arrival in Bangkok

• Arrive at Suvarnabhumi Airport and check into your hotel
• Take a stroll around the vibrant streets of Bangkok, visit the famous Wat Phra Kaew (Temple of the Emerald Buddha) and the Grand Palace
• In the evening, head to Khao San Road for some street food and nightlife

Day 2: Exploring Bangkok

• Start your day with a visit to the iconic Wat Arun (Temple of Dawn)
• Take a boat ride along the Chao Phraya River and explore the local markets
• Visit the Jim Thompson House, a beautiful traditional Thai house turned museum
• End your day with a relaxing massage at one of Bangkok's many spas

Day 3: Chiang Mai

• Fly to Chiang Mai, a charming city in northern Thailand
• Visit the Doi Suthep temple, located on a mountain overlooking the city
• Explore the local night market and try some delicious northern Thai cuisine

Day 4: Elephant Sanctuary and Cooking Class

• Spend the day at an ethical elephant sanctuary, where you can feed, bathe and interact with these gentle giants
• Learn how to cook traditional Thai dishes at a cooking class in the evening

Day 5: Relaxation and Departure

• Spend your last day in Thailand relaxing by the pool or exploring the city at your own pace
• Depart from Chiang Mai International Airport with unforgettable memories of your trip to Thailand.

I hope this itinerary helps you plan your trip to Thailand!