Absolutely! Visiting Bangkok, Chiang Mai, and Nakhon Si Thammarat in Thailand can be a wonderful experience. Let me share some travel tips to ensure a smooth voyage.

Best Time to Visit:
The best time to visit Thailand is between November and early April when the weather is cooler and dry. However, for beach destinations like Nakhon Si Thammarat, the months from January to April are considered ideal.

Route and Accessibility:
Bangkok's Suvarnabhumi Airport is an important international hub with many connecting flights. You can easily reach Chiang Mai and Nakhon Si Thammarat from Bangkok via domestic flights. Alternatively, there are bus and train services available too.

Altitude and Acclimatization:
Bangkok, Chiang Mai, and Nakhon Si Thammarat are all at low altitudes so acclimatization is not a concern. However, you might need some time to adjust to the tropical heat.

Accommodation and Booking:
It’s suggested to book your accommodations ahead of your visit. There are plenty of options ranging from budget hostels to luxury hotels. Online booking platforms can help you find the best deals.

Clothing and Essentials:
Lightweight, breathable clothing is recommended due to the tropical climate. Don't forget to pack your swimwear if you plan to visit the beaches. A sun hat, sunglasses, and sunscreen are must-haves. An umbrella or waterproof jacket might also be handy in case of sudden showers.

Health and Safety:
Avoid drinking tap water. Stick to bottled water and make sure any ice is made from purified water. Carry essential medicines, mosquito repellent, and first aid kit. Follow traffic rules and be careful while crossing the streets.

Local Etiquette and Respect:
Thais greet each other with a 'wai', a sign of respect - it's not necessary for tourists but is appreciated. It's respectful to dress modestly, especially when visiting temples. Also, feet are considered the lowest part of the body, so avoid pointing your feet at people or sacred objects. Respect the Thai monarchy, as criticizing the royal family is against the law in Thailand.