So this may be a stupid question, but I’ll ask it anyway just to be sure.
I’m going to be taking a 30 day vacation starting in Thailand for the first week, then Vietnam, Cambodia, and then back to Thailand for the last week of my trip.
Will I encounter any problems re-entering Thailand once I leave to travel in VN & CAM??
The entire trip is an exact total of 30 days.
TLDR : Answer Summary
The user is concerned about re-entering Thailand after spending time in Vietnam and Cambodia during a 30-day vacation. According to comments, a USA passport holder can stay in Thailand for 30 days without a visa upon entry, and can re-enter Thailand unlimitedly by air, although land border re-entries are limited to twice in a calendar year.