As a tourist, here are a few things you will need to put on to make your stay in Thailand memorable.
Before getting packed for any vacation, you need to ask yourself what you need to stay comfortable in the country. What does a country with a more reserved culture do? What should one wear in the hot and humid weather of Thailand? This is a simple task! Just by reading this, you won't have any issues fitting in with the local customs. Learn appropriate attire for visiting temples, the beach, and other locations in Bangkok. Find out which materials are best, which shoes are most comfortable, and more.
Sunscreens with chemicals known to harm coral were prohibited in Thailand's national parks last year. There is a discussion of fines of up to 1000 baht (almost US$3000), but we cannot attest to the effectiveness of law enforcement. You should err on the side of caution and search for sunscreens that employ zinc oxide or titanium oxide instead of oxybenzone, octinoxate, 4-methyl benzylidene camphor, or butylparaben. As the word "reef-safe" is unregulated, you should always double-check the components before using it.
In search of a certain brand, a high sun protection factor, or cruelty-free or hypoallergenic formulations? You should carry your sunscreen unless you happen upon a Bangkok immigrant grocery or a luxury hotel gift store that has it in stock. You can choose one that is non-sticky and keeps your skin protected without bothering your skin all day.