I've read conflicting information, i'm coming from the U.S. and i would like to stay for 2 weeks, do i need to apply for any kind of visa or do i have an automatic entry if under 30 days?
TLDR : Answer Summary
If you are a U.S. citizen planning to visit Thailand for two weeks, you do not need to apply for a visa in advance. Upon arrival, you will receive a 30-day visa exemption stamp, allowing you to stay in Thailand without the need for an additional visa.