There are a few key items you won’t want to travel without in Thailand. Sunscreen is essential, as the tropical sun can be intense, and it tends to be more expensive locally. Insect repellent is another must, especially if you’re planning to explore nature or stay in more rural areas. A reusable water bottle will help you stay hydrated while reducing plastic waste, and bringing any personal medications is always wise, even though local pharmacies are usually well-stocked.
Don’t forget your travel insurance documents—both printed and digital copies are useful in case of emergencies. And finally, a waterproof pouch or dry bag will come in handy for beach days, island hopping, or unexpected downpours during the rainy season.