Thailand was Southeast Asia’s tourism leader in 2024 with 35.5 million international arrivals, per UN Tourism — close behind Japan for the region’s top spot. The country splits cleanly into a mainland circuit and an island circuit, which rarely work well combined into a single short trip.
Mainland
- Bangkok — The near-universal entry point and a destination in its own right: temples, markets, and a food scene that most visitors do not allow enough time to explore.
- Chiang Mai — Northern Thailand’s cultural base — ancient temples, the Yi Peng lantern festival, and access to national parks and ethical elephant sanctuaries.
- Ayutthaya — The Ayutthaya Historical Park, a former capital’s ruins, usually a day trip from Bangkok.
- Krabi — Southern mainland coast with limestone cliffs, caves, and access to over 150 islands along a roughly 150km coastline.
- Pattaya — The closest beach-and-nightlife destination to Bangkok, on the eastern Gulf coast.
Islands
- Phuket — Thailand’s largest island at 540 km², with beaches ranging from the busy Patong strip to the quieter Nai Harn.
- Koh Samui — The country’s second-largest island; Chaweng and Lamai are the developed resort beaches, contrasting with the quieter west coast.
- Phi Phi Islands — A compact island group between Phuket and the Malacca Strait, reachable as a day trip or overnight stay.
- Koh Phangan & Koh Tao — A quick ferry from Samui; Koh Phangan for the Full Moon Party, Koh Tao for diving.
- Koh Lipe — Marketed as the “Maldives of Thailand” for its white sand and snorkeling, and noticeably less developed than the other islands on this list.
Also worth knowing: the Trat islands near the Cambodian border — Koh Chang, Koh Kood, Koh Mak — are gaining attention as a quieter alternative to the more established island circuit.
Planning note
Peak-season Thailand (roughly December through February) books out well in advance — travel guides consistently recommend confirming accommodations and inter-island transport at least eight weeks ahead, with December bookings ideally locked in by mid-October. See shoulder-season trip planning for strategies to avoid peak-time bottlenecks. Mainland and island legs rarely combine well in under 10 days once transfer time between them is accounted for. If Phuket is on your route, check the current Phuket forecast for your days there.
Sources
- BestPrice Travel — Top 10 Destinations to Visit in Thailand
- Thailand Starts Here — The Best Thailand Islands for 2026 and 2027
- UN Tourism World Tourism Barometer, January 2025
Read the Top 10 Countries to Visit in 2026 roundup for how Thailand compares globally.
