Hello! That sounds like an exciting trip to the beautiful northern part of Thailand. Here are some travel tips for your visit to Chiang Rai, Pai, and Nan.

Best Time to Visit:
The best time to visit these locations is during the cool season, between November and February, when the weather is most pleasant.

Route and Accessibility:
You can fly into Chiang Rai via the international Suvarnabhumi Airport in Bangkok. Buses and minibuses run regularly from Chiang Rai to Pai and Nan. Alternatively, you can hire a car and drive yourself, as the roads are well-maintained.

Accommodation and Booking:
Chiang Rai, Pai, and Nan offer a variety of accommodations from budget to luxury. It’s best to book in advance, especially during peak season. Websites like Booking.com or Agoda can provide you with multiple options to suit your budget and preference.

Clothing and Essentials:
Pack lightweight clothing for the day and warmer layers for the night when the temperature can drop. Don't forget to pack a good pair of walking shoes, sun protection, and a water bottle. If you plan on visiting temples, ensure you have clothing that covers your shoulders and knees.

Health and Safety:
Ensure you're updated on routine vaccines before your trip. Also, as these areas are quite tropical, mosquito repellents can come in handy to protect against mosquito-borne diseases. Keep yourself hydrated, especially during treks.

Local Etiquette and Respect:
Thais are very respectful of their religion and monarchy. When visiting temples, behave respectfully. Don't touch anyone's head or point your feet at people or statues. It's also recommended to learn a few basic Thai phrases.