First trips to Thailand tend to go wrong in the same predictable ways, and almost all of them are avoidable once you know they exist. This guide walks through the nine mistakes we see first-timers make most, from the over-ambitious itinerary to the scooter-without-a-licence gamble to the small cultural slip-ups that carry surprisingly large consequences. For each one, you get what actually goes wrong and, more usefully, what to do instead.
Prices here are in Thai baht with US dollars in parentheses at ฿33 = US$1 (July 2026), and rules, fees and rates all change, so treat the figures as a guide and confirm the current situation locally or with the official source. If you are still shaping the trip, start with our planning a trip to Thailand guide, and once you land, see what is on with live Thailand events.
The 9 mistakes at a glance
| # | The mistake | What to do instead |
|---|---|---|
| 1 | Cramming three cities into seven days | Pick two bases, go deeper, save the rest for next time |
| 2 | Renting a scooter with no licence or insurance | Carry a motorcycle IDP + home licence, or skip the scooter |
| 3 | Turning up to temples underdressed | Cover shoulders and knees; dress strictest for the Grand Palace |
| 4 | Taking a tuk-tuk “lucky Buddha” tour | Agree a price to one named place, or use a ride-hailing app |
| 5 | Changing money at airport bank booths | Use an ATM on arrival, then an in-town changer for bigger sums |
| 6 | Ignoring the two-monsoon coast switch | Match the coast to the month before you book |
| 7 | Booking an island in its rainy season | Andaman in the dry half, Gulf in the other half |
| 8 | Drinking whisky buckets blind | Buy sealed drinks, pace yourself, don’t leave a drink unattended |
| 9 | Disrespecting the monarchy by accident | Handle money and royal images with care; the money rule matters |
What is the biggest itinerary mistake?
Trying to see too much. The classic first-timer error is the three-cities-in-seven-days trap: Bangkok, then Chiang Mai, then a southern island, all in one week. On paper it looks efficient. In reality, each move costs you a half-day of packing, transfers, airport time and checking in, so a seven-day trip with three bases can burn three of those days on logistics alone, and you arrive everywhere tired.
Do the opposite. For a week, pick two bases at most, for example Bangkok plus one region, and give each enough time to feel like more than a checklist. Thailand rewards slowing down, and the country will still be here for a second trip. Our planning a trip to Thailand guide lays out realistic routes by how many days you actually have.
Do you need a licence to rent a scooter?
Yes, and skipping it is the mistake with the highest stakes. Thai law requires a motorcycle licence from your home country plus an International Driving Permit that specifically covers the motorcycle category. Plenty of rental shops will hand you a scooter with no checks at all, but that just moves the risk onto you. Police run checkpoints in tourist areas like Phuket, Pattaya and Koh Samui, and fines for unlicensed foreign riders run roughly ฿500-2,000 (US$15-60).
The fine is the small problem. The big one is that riding without the correct licence is a standard exclusion in most travel insurance policies, so if you crash, common on unfamiliar roads in flip-flops, your insurer may refuse the claim and leave you paying Thai hospital bills yourself. Sort out a motorcycle-category IDP before you fly, check your policy’s exact wording on motorcycles, and wear a helmet. If any of that is missing, take taxis, songthaews and ride-hailing apps instead. Our renting a scooter in Thailand guide covers the documents and the rental-deposit traps in detail.
What should you wear to temples?
Cover your shoulders and your knees, for both men and women. Sleeveless tops, tank tops, short shorts and ripped jeans will get you turned away at the more serious sites. The Grand Palace and Wat Phra Kaew in Bangkok enforce the strictest dress code in the country and also reject tight leggings and see-through fabric, so wear real trousers or a long skirt there rather than assuming you can improvise.
If you do turn up underdressed, most temples and the Grand Palace itself sell or rent cover-up clothing near the entrance, but it is easier and cheaper to just dress for it in the first place. Remember you also remove your shoes before entering any temple building. Our what to wear in Thailand guide covers how to stay temple-appropriate and cool in the heat at the same time.
Why avoid the tuk-tuk “lucky Buddha” tour?
Because it is a commission scam, not a sightseeing deal. The setup is familiar: a friendly tuk-tuk driver in Bangkok offers a cheap all-day tour taking in a few temples plus a “lucky Buddha” or a “special one-day-only” promotion. The real itinerary is built around gem shops and tailor shops that pay the driver to deliver you, and the sales pressure inside can be relentless. The temples you actually want, like Wat Pho and Wat Arun, are open to anyone for a normal entry fee and need no driver-guide.
Instead, agree a fixed price to a single named destination before you get in, or skip the negotiation entirely and use a metered taxi or a ride-hailing app. Our tuk-tuks in Thailand guide explains fair pricing, and our Thailand travel scams guide covers this and the other classic setups so you can spot them coming.
Where should you change money?
Not at the airport bank booths. Those consistently offer some of the worst rates you will see, in some cases around 7% worse per US dollar than a good in-town changer, according to rate comparisons as of 2026. Changing your whole trip’s cash there is money simply handed away.
A better approach: withdraw baht from an ATM when you land to cover your first day or two. Thai ATMs charge a fixed foreign-card fee, commonly around ฿220 (US$7) per withdrawal as of 2026, so take out a larger amount in one go rather than several small ones. For bigger sums, use a reputable in-town money changer such as SuperRich, which posts far better rates than airport banks and charges no commission. Confirm the day’s rate and any card fees before you commit, since both move.
Which coast should you pick for the season?
Whichever one is dry that month, because Thailand runs two monsoons on opposite schedules and getting this wrong can rain out an entire beach holiday. The Andaman coast (Phuket, Krabi, Khao Lak) is wettest from roughly May to October, peaking around September. The Gulf islands (Koh Samui, Koh Phangan, Koh Tao) are wettest from roughly October to December, peaking in November.
So the fix is simple once you know it: a September trip points you to the Gulf, a February trip works almost anywhere, and a November trip points you back to the Andaman just as the Gulf gets soaked. Booking Phuket in September or Koh Samui in November, without knowing this, is one of the most common and most disappointing first-timer mistakes. Check our best time to visit Thailand guide before you lock in flights and hotels, and note that even in the wet season the rain often comes in short heavy bursts rather than all day.
Are whisky buckets safe?
Approach them with caution rather than treating them as a harmless party staple. The buckets sold at beach bars and parties usually mix a local spirit with a Thai energy drink and a soft drink, and the caffeine masks how drunk you actually feel, so people routinely drink far more than they planned. The larger risk with any communal or unsealed drink is simply not knowing what is in it or who has touched it.
The safer play is to buy sealed, bottled drinks you open yourself, keep your drink with you, and pace it against the heat. If you do share a bucket, share it with people you trust and never leave it unattended. Getting badly drunk is also how many of the other mistakes on this list happen, the unlicensed midnight scooter ride being the obvious one.
How do you avoid disrespecting the monarchy?
Treat Thai money and any image of the royal family with genuine care, because this is the mistake with the most serious legal weight. Every Thai banknote and coin carries a portrait of the King, and Thailand’s lese-majeste law (Section 112 of the Criminal Code) makes disrespecting the monarchy a serious crime, carrying 3 to 15 years of imprisonment per count as of July 2026, one of the strictest such laws anywhere.
In practice this means: do not step on money to stop it blowing away, put your foot on a coin, or handle banknotes carelessly, since the King’s image is on them. Do not make jokes, gestures or social-media comments at the monarchy’s expense, and stand respectfully when the royal anthem plays in cinemas and at some events. This is not something tourists are singled out for, but it is taken seriously, so err firmly on the side of respect. Thai people themselves are warm and forgiving of honest mistakes, and a little awareness goes a long way.
Where to next
Get the foundations right and the rest of the trip gets easier. Start with planning a trip to Thailand for routes and timing, read Thailand travel scams so the tuk-tuk and gem-shop setups do not catch you, and check what to wear in Thailand before your first temple day. If you plan to get on two wheels, renting a scooter in Thailand covers the licence and insurance rules properly, and best time to visit Thailand settles the coast-and-season question. Two more worth knowing before you go: kratom in Thailand covers a legal grey area travellers walk into unaware, and Thailand for seniors covers the accessibility and pacing questions the standard advice skips. When you are ready to fill the days, browse what is on right now in Thailand events.
Sources
- Bank of Thailand and reporting on Section 112 (lese-majeste), including the 3 to 15 year penalty range, via Wikipedia: Lese-majeste in Thailand and Council on Foreign Relations.
- Scooter licence and International Driving Permit requirements and roadside fines, via IDP for Thailand (2026 guide) and Thailand scooter/motorbike licence rules 2026.
- Temple and Grand Palace dress-code rules, via Thailand temple dress code guide (2026).
- Airport versus in-town exchange rates, via Best currency exchange rates at Suvarnabhumi Airport and SuperRich Thailand.
- Two-monsoon coast timing (Andaman vs Gulf), via Thailand monsoon season 2026 (Wego) and Thailand rainy season by island.
- Whisky-bucket and Full Moon Party drink-safety cautions, via Full Moon Party Thailand 2026 (Saily).