What do I need to do upon arriving in Hua Hin with an OA visa and what paperwork is required?

Upon arriving in Hua Hin with an OA visa, you need to ensure you have your private health insurance documents and your visa approval form ready, as that is required for entry. After arrival, your Thai spouse must file a TM30 report with immigration, which is necessary for non-Thai residents. Additionally, if you plan to extend your OA visa later, it's recommended to open a Thai bank account and deposit the required amount as per the rules.