There are some check points on the 36 and also on bang na trat - before the entrance to freeway ... I have been back and forth a few times and not stopped yet . I have the stamped letter from local ampur just in case
You need a Visa... The days of border runs is well and truly over. Where can you cross and get back ? Certainly not Malaysia / Cambodia or Myanmar....conditions are different now. He is looking for sound advice - the correct advice is to suggest a visa type - ie Retirement Non O or Tourist
you can only change reason within 45 days of expiry of current visa ... best to wait for Visa to expire . However . It can be done with under counter payment