Hello! It's great to hear that you're planning to visit Nakhon Pathom, Udon Thani, and Surin. Here are some tips for your journey!

Best Time to Visit:
The best time to visit Thailand is during the cool and dry season, typically between November and April. Rainfall is usually minimal during this period, offering sunny days and pleasant temperatures for sightseeing.

Route and Accessibility:
Nakhon Pathom, Udon Thani, and Surin are well-connected to other parts of Thailand. You can reach these cities by bus, train, or flight from Bangkok. The most convenient way could be taking a domestic flight to Udon Thani, and then continue to Surin and Nakhon Pathom by train or bus.

Accommodation and Booking:
Each city offers a range of accommodations, from budget-friendly guest houses to luxury hotels. Booking can be done on popular travel websites or directly with the hotel. It's recommended to book in advance, especially if you're traveling during peak season.

Clothing and Essentials:
Pack lightweight and breathable clothes due to the warm weather. Don't forget sunscreen, sunglasses, a hat, and a reusable water bottle. For visiting temples, it's important to carry modest clothing that covers your shoulders and knees.

Health and Safety:
Ensure you are up-to-date with routine vaccines before traveling. Use bottled water for drinking and brushing teeth. Respect local customs and be aware of safety in busy areas.

Local Etiquette and Respect:
Thai people are known for their politeness and hospitality. When visiting temples, dress modestly and remove your shoes before entering. Avoid touching people's heads as it's considered disrespectful. The 'wai', a form of greeting involving a slight bow with palms pressed together, is commonly used.