Hi all. I have entered and re-entered Thailand via Air over the past 7 or so months using visa exemption stamps and 30-day extensions. However, I noticed upon my most recent entry that the immigration officer started to ask more questions than usual, so I suspect my luck is running out using this method.

Next time I plan to leave the country and apply for an actual 60-day tourist visa to ensure I'm granted entry. What is the most cost efficient and easiest way to do this? I've heard good things about the overnight sleep train to laos there and back. Is it recommended?

(note- I'm aware I could just fly to another country but I'm exploring other land based options)

Thanks!