The safest and most efficient strategy for 2026 is a "three-tier" approach: a travel-specific debit card, a backup credit card, and a small amount of "emergency" cash. For daily spending, prepaid travel cards (like Wise, Revolut, or Charles Schwab) are ideal because they offer mid-market exchange rates and allow you to freeze the card instantly via an app if it's lost. Thailand is still a very cash-heavy society, especially for street food and local markets, so you will need to use ATMs. To stay safe, only use ATMs located inside bank branches or major shopping malls during daylight hours to avoid "skimming" devices. Always decline the "Dynamic Currency Conversion" (DCC) on the ATM screen—opt to be charged in Thai Baht (THB) to let your own bank handle the conversion. Avoid carrying large wads of cash in your wallet; instead, keep a "dummy wallet" with a few hundred Baht for quick transactions and hide your main cards and larger bills in a secure, internal pocket or a hotel safe.