You don’t need a return ticket but it is likely that the originating airline will ask for proof of onward journey before your 60 day exemption is up (even if you intend to apply for 30 additional days). You would be best to contact the airline directly.
right though each entry is limited to 60 days so one has to leave by the 60th day and re-enter to reset the clock (or extend at immigration for another 30 days).
Good question. The rules can be less clear-cut compared to land-based accommodations. Generally, if you are the property owner (or in this case, the boat owner), you’re responsible for filing your own TM30 when you arrive in Thailand to stay on the boat.
To ensure compliance, it might be best to check with the Thai Immigration Bureau or a local immigration office in Thailand, as regulations can sometimes vary by region.
If you are staying in a hotel in Thailand, the hotel is responsible for submitting the TM30 form on your behalf, as they are required to report foreign guests’ stays to immigration. However, if you’re staying in a private apartment, condo, or house, the landlord or property owner is required to file the TM30 to notify immigration of your stay.
In either case, the TM30 is necessary, but the responsibility for filing it differs depending on the type of accommodation. It’s a good idea to check with your accommodation provider to ensure the TM30 is properly submitted.