You'll wake up on the overnight train somewhere near Lampang, the mountains still wrapped in mist, and realise you've been in Thailand for three days and haven't touched a beach yet. That's fine. The best two-week trips here aren't about rushing south to the sand. They're about getting the balance right between Bangkok's chaos, the temples and mountains in the north, and the islands at the end when you've earned them.
Here's a route that works: days 1 to 3 in Bangkok, the overnight train north on day 3, days 4 to 7 in Chiang Mai, fly south on day 8, and days 9 to 14 on the Andaman or Gulf coast. It's not the only way to do it, but it's a rhythm that gives you enough time in each place without wasting days on transfers.
Start in Bangkok, but Don't Overstay
Bangkok has two airports, two international train stations, and enough to fill a month if you let it. For a two-week trip, three days is the right amount. You'll want to do the Grand Palace early, and when I say early, the official opening is 8:30am and you should be in the queue before that. Entry is around 500 baht. The Grand Palace complex houses Wat Phra Kaew, home to the Emerald Buddha, the statue the Thai King personally re-robes three times a year. Yes, it is genuinely spectacular, crowds and all.
Wat Pho is a short walk from the Grand Palace. Entry is around 200 baht. The Reclining Buddha is 46 metres long and properly gold-plated, and the temple complex itself is worth an hour of wandering. From Tha Tien pier just outside, a 3-baht boat crosses to Wat Arun on the opposite bank of the Chao Phraya. The ferry is the sensible way to move between these three sites. The Chao Phraya Express runs for 15 baht local fare or 40 baht on the tourist boat, and you'll see more of Bangkok from the river than from the inside of a taxi. Get on the orange-flag local boat at Central Pier (Saphan Taksin BTS), ignore the touts at the pier who will try to sell you expensive tickets, and ride north.
The dress code at these temples is strict. Shoulders and knees covered, no leggings at the Grand Palace. Bring a scarf or buy cheap cotton trousers from the markets outside. Khao San Road is ten minutes' walk from the palace. If you're there anyway, Rambuttri Alley, the quieter street running parallel, is a better option than the main drag, which has tipped too far into bucket cocktail and bucket list territory to feel anything other than performative. You're not missing much by skipping it entirely.
For food in Bangkok, the mall food courts are genuinely good and often overlooked. Air-conditioned, clean, English menus, and the same Thai cooking you'd find at the street stall outside. Street food dishes still run around 40 to 80 baht per plate (pad kra pao, som tam, guay tiew) and anyone who tells you they survived on one dollar meals hasn't been recently. Prices have gone up, but it's still cheap. A bowl of noodles you'd struggle to find for under eight quid in London costs 60 baht at a pavement stall in Bangkok.
North: Chiang Mai and Its Mountains
The overnight train from Bangkok to Chiang Mai is one of those journeys that justifies itself as an experience, not just transport. Train 9, the newer CNR sleeper, departs Krung Thep Aphiwat Central Station at 18:40 and arrives in Chiang Mai at 07:15 the following morning. A second-class air-conditioned sleeper berth runs around 938 to 1,038 baht for upper or lower, with lower berths costing slightly more because they're wider and have better window access. First class (a private two-person cabin) is 3,092 baht for the whole compartment. Book through the official SRT D-Ticket app or via 12Go Asia, and book early. Train 9 sells out weeks ahead, sometimes months ahead at peak periods like New Year and Songkran. If you arrive in Chiang Mai on time, a songthaew from the station to the Old City costs 40 to 60 baht.
Chiang Mai divides neatly into two worlds: the Old City inside the moat, and Nimman Road to the west. The Old City is walkable, temple-dense, and has a good range of accommodation. Nimman, known locally as a hub for digital nomads and coffee shops, is where you go when you want a flat white and reliable Wi-Fi. They serve different purposes and you'll probably want both.
Wat Phra That Doi Suthep is the temple you can see from almost anywhere in the city, sitting 12km up the mountain above Chiang Mai. It opens at 6am and closes at 6pm. The simplest way up is to rent a motorbike (150 to 250 baht per day depending on the bike, according to rental shops across town) though if you prefer not to ride, songthaews go up regularly from Chiang Mai University. At the top, there are 309 steps (a Naga staircase guards the approach) and a golden chedi that glows in the late afternoon. Come in the early evening if you can, when the monks gather for prayers as the sun drops behind the mountains. It gets cold up there after sunset.
For the markets: the Night Bazaar runs nightly from around 5pm on Chang Klan Road between Sridonchi and Tha Phae Roads. It's commercial but fun, and prices are negotiable. The Sunday Walking Street along Rachadamnoen Road, running from near Tha Phae Gate to Wat Phra Singh, runs 4pm to midnight and is bigger, louder, and sells more crafts from local artisans. The Saturday Walking Street on Wua Lai Road is the smaller, calmer alternative. Chiang Mai's live music is also worth noting: Boy Blues Bar in the Night Bazaar and North Gate Jazz Co-op (open mic on Tuesdays) near Chang Phuak Gate are consistent, local, and easy to stumble into.
If you have time for a day trip north, Chiang Rai is worth the three-hour bus ride. The White Temple (Wat Rong Khun) and the Blue Temple (Wat Rong Suea Ten) are both genuinely unusual buildings, nothing like the traditional Thai temple aesthetic. Chiang Rai itself is smaller and noticeably less tourist-saturated than Chiang Mai, which is either a recommendation or a warning, depending on what you're after.
South: The Andaman Coast Versus the Gulf
Here is where most people overthink it. The south splits geographically into two coasts with different weather patterns: the Andaman coast (Phuket, Krabi, Koh Lanta) and the Gulf of Thailand (Koh Samui, Koh Phangan, Koh Tao). They're not especially close to each other and hopping between them eats days. Pick one coast and stay there.
The Andaman coast runs its dry season from November to April. Krabi is the better base for first-timers: it has an international airport with direct flights from Bangkok, and it sits close enough to Railay Beach, Koh Phi Phi, and Koh Lanta to make island-hopping straightforward. Railay itself is only accessible by boat. Limestone cliffs on three sides make road access impossible, and that inaccessibility does keep it quieter than Ao Nang. The rock climbing on the Thaiwand Wall costs around 70 to 100 USD for a guided day course, and sea kayaking through mangroves and caves runs 30 to 50 USD. These are not cheap activities by Thai standards, but they're the kind of thing you'll still be talking about. Koh Lanta, accessible by ferry from Krabi, is the slower alternative: flat roads suited to a rented scooter, quieter beaches, and significantly cheaper accommodation than Koh Phi Phi, which has become its own kind of expensive party island.
The Gulf islands are best for those flying in after the Andaman wet season (roughly May to October), since Koh Samui's drier window runs January through August. Koh Samui has its own airport, but Bangkok Airways has historically held close to a monopoly on flights in and out, which keeps prices higher than you'd expect. Chaweng Beach on Samui is the main tourist hub (nightlife, water sports, resorts stacked three-deep) while Bo Phut Beach on the north coast is quieter and has a decent Friday night Fisherman's Village walking street. Koh Tao, a two-hour speedboat north of Samui, is one of the world's more accessible diving destinations. Accommodation on the major islands (Phuket, Samui, Phi Phi) can run 25 to 50% more than equivalent rooms on the mainland. Budget accordingly.
Getting Around and What It Actually Costs
Domestic flights between Bangkok and Chiang Mai or between Bangkok and Phuket/Krabi take around an hour and a half and, booked in advance, can cost less than the overnight train. That said, the train is the better experience on the northbound route. You wake up to misty mountains rather than the inside of a budget airline. For the return leg, flying south to Bangkok is the practical option.
The Grab app works in Bangkok, Chiang Mai, and Phuket, operates like a standard ride-share, and removes all the negotiation from taxis. Use it. ATMs in Thailand charge a flat fee of around 220 baht (roughly 6 USD) per withdrawal. Get a travel card that reimburses foreign transaction fees before you leave home, or withdraw larger amounts less often.
For the two weeks as a whole, a mid-range traveller spending on boutique guesthouses, some restaurant meals, day trips, and a couple of activities can expect to spend around 3,000 to 4,000 baht per day (roughly 85 to 115 USD) excluding international flights. Budget travellers sticking to street food, hostels at 400 to 700 baht a night, and public transport can manage closer to 1,000 to 1,500 baht daily. The islands push those numbers up by 25 to 50% compared to the mainland north. If Christmas and New Year fall within your window, book accommodation months in advance, not weeks. Some properties on Koh Samui and Koh Phi Phi sell out entirely before September for the December period.
The best time to visit, if you have flexibility, is November through February. The north is cooler and clearer, the Andaman coast is in its dry season, and the Gulf islands are mostly settled. March to May is hot almost everywhere, and the north can have smoke from agricultural burning, some years worse than others. Check the air quality index before committing to Chiang Mai in March.