Hello; new here and hopefully this is a simple question. US citizens, first visit to Thailand, arriving by air to BKK 1/11/2026 staying until 1/31/2026 flying to Luang Prabang from Chiang Mai and flying back to Chiang Mai on 2/5/2026 with plans to visit the southern area of Thailand for at least three weeks. Have not booked our departure flight out of BKK to Hanoi yet. On the government website, what would be the correct tourist visa to apply for? When we fly to Laos and back, does that "reset" the clock? Will we need to show our onward ticket to Hanoi, or somewhere else outside of Thailand? Thanks.