Visiting Temples - The Thailand dress code is perhaps more important for visiting temples than anything else. Temples are sacred to Buddhists in Thailand and are generally active places of worship and spiritual study. Revealing clothes are considered extremely disrespectful in these locations, and you'll likely be turned away if you’re not dressed properly. In general, both men and women need to cover at least their shoulders and knees. Men should wear pants, and women can wear capris or longer skirts or dresses. T-shirts are acceptable, but sleeveless tops are not, though women can cover bare shoulders with a scarf or shawl.
Hiking/Trekking - Thailand has lots of great hiking and trekking options, and the same clothing you wear for outdoor activities at home will probably work. The key is to wear clothes made from sweat-wicking fabrics, which will keep you more comfortable on the trail. They’ll also dry quickly if you get splashed at a waterfall, and they usually don’t take up much space in your bag. Despite the heat, you should definitely wear pants when hiking in Thailand. Brush and leaves and all manner of biting insects will be kept at bay by a good pair of quick-dry hiking pants. Opt for ventilated hiking shoes so that your feet won't get too hot.
Diving, Snorkeling, or Surfing - What’s a trip to Thailand without getting into the ocean? It’s home to some of the best – and cheapest – diving in the world, and has a few up-and-coming surfing spots as well. Though most people just wear a swimsuit for snorkeling, many of them end up with very sunburnt backs, so a rash guard is a really good idea. You’ll definitely want a rash guard for surfing, and probably a wetsuit for diving. While most surf and dive shops provide attire, it’s definitely better to have your own.
Similarly, avoid using your feet to move or pick up objects, and do not step over people or even objects on the floor.
