TLDR : Answer Summary
When arriving in Bangkok, travelers are primarily advised to have a valid passport and proof of accommodation. Although some users mentioned that proof of travel insurance, an onward flight ticket, and a bank statement are not strictly required, it's noted that certain situations may still necessitate these documents. Generally, travelers are mostly asked for proof of funds (20,000 baht or equivalent), a confirmed hotel reservation, and proof of onward travel, especially by airlines prior to boarding. Variability in enforcement based on nationality and the discretion of immigration officers is common, with many travelers reporting no issues during past trips.