The general consensus is that you cannot directly do a border run to Burma (Myanmar) from Hua Hin. The closest and most practical border crossing is in Ranong, where the Kawthaung border checkpoint is open for visa runs. Travelers can stay for about two weeks in Kawthaung, Myanmar. Some comments suggest checking the Sinkhon Pass, though its opening status is uncertain. Overall, the community advises against it for various reasons, including concerns about supporting the Myanmar regime.