What should a first-time traveler see in Thailand beyond the obvious highlights?

Thailand has eight properties on the World Heritage List, and they are distributed in a way that forces you out of the familiar triangle of Bangkok, Chiang Mai and the islands. The historic cities of the central plain, the forest complexes along the Myanmar border and the archaeological landscape of the northeast each sit in a different part of the country, so a heritage-led itinerary is automatically a geographic one.

The intangible list points the same way. UNESCO has inscribed six Thai elements on its Representative List: Tomyum Kung and Kebaya in 2024, Songkran in 2023, Nora in 2021, Nuad Thai in 2019 and Khon in 2018. Nora is a dance drama of southern Thailand; Khon is the masked dance drama of the central court tradition. Seeing either in its home region — rather than in a hotel floor show — is the kind of thing a first trip rarely plans for and almost always remembers.

Songkran, inscribed in 2023 at the 18th session of the Intergovernmental Committee under decision 18.COM 8.b.10, falls in mid-April after the rice harvest, and its practices are described as the pouring of water to symbolize cleansing and good fortune, the bathing of important Buddha images, family reunion and honoring of elders, and folk plays, games, music and feasting. It is the one date on the Thai calendar that reshapes an itinerary rather than decorating it.

The central plain is flat, hot and worked, with brick monument bases standing above rice ground and little shade between them. The northeast sits higher and drier; the south narrows to a peninsula where the sea is never far from the road. These are three different countries to travel in, not three versions of one.

Mid-April is both the Songkran window and the tail of the hot season, and the Central Plain's rainfall normal for November is just 28.7 mm against 237.7 mm in September — so the dry months and the country's single biggest festival do not coincide. A trip that wants Songkran accepts the April heat; a trip that wants the cool, dry months accepts missing it.

• Central plain — Historic city sites, best walked early, with almost no natural shade between monuments.
• South — Nora's home region, and the part of the country where the sea sets the schedule.
• Northeast — The least-visited quarter, and the one where a day's driving buys the most that other itineraries skip.

The advisory stands at Level 1, Exercise Normal Precautions, with the explicit caveat that some areas have increased risk — which is a reason to check region by region rather than nationally when planning the border provinces. The visa position is in flux: most US citizens may stay under 60 days without a visa, subject to registering online before arrival, but the State Department warns the allowance may be cut to 30 days, which would reshape a long multi-region trip. The Thailand Digital Arrival Card must be submitted online within three days before arrival, by every non-Thai national, whatever the mode of entry.

The food-and-drink question in this group takes up Tomyum Kung and the regional kitchens that go with these three parts of the country.