Of course! Your trip to Chiang Rai, Pai, and Nan in Thailand sounds exciting! Here are some travel tips you might find useful:

Best Time to visit:
The best time to visit these places is during the cool and dry season from November to March. However, be aware that December and January can be quite busy due to peak tourist season.

Route and Accessibility:
Starting from Chiang Mai, you can take a bus to Pai (about 4 hours), then another bus to Chiang Rai (about 3-4 hours). After exploring Chiang Rai, you can finish off your trip by taking a bus to Nan (about 5-6 hours). There are also direct flights from Bangkok to each of these locations.

Altitude and Acclimatization:
These locations are all at a low altitude, so you don't need to worry about high altitude sickness.

Accommodation and Booking:
It is advised to book your accommodations in advance, especially during peak season. There are plenty of boutique hotels, guesthouses, and hostels to choose from, catering to various budgets.

Clothing and Essentials:
Pack summer clothing and a light jacket for the cooler evenings. Also, don't forget your swimwear for waterfall visits. Good walking shoes would help for hiking and exploring the cities.

Health and Safety:
Use sunscreen and drink plenty of water due to the warm climate, and watch out for mosquitoes - use a reliable repellent. Be cautious of your belongings and keep an emergency contact list.

Local Etiquette and Respect:
Respectful dressing, especially in temples, is important. Thai people hold their King and their religion in high regard, so ensure to be respectful of this. Any currency with the King's image should be handled carefully. Learn the basic phrases in Thai; this can help you connect better with the locals.