I am a US citizen and can enter Thailand with a 30 day Visa exempt stamp.
I want to travel to Singapore for 3 or 4 days while in Thailand. Do I need to apply for a re-entry permit? I do not plan to stay in Thailand more than 30 days, so I it is not important to get new 30 day visa exempt stamp. I just want to make sure that I can re-enter Thailand without the re-entry permit.