@Brian **********
Yeah with Laos so incredibly close (the Golden Triangle immigration checkpoint is just 33km away) I don't understand farang runners obsession with Mae Sai. Is it the border market? One can easily catch a boat to the Lao Golden Triangle Special Economic Zone and back and do it all within 30-45 minutes. Moreover, the Mekong River is more picturesque than the scruffy border town of Tachilek and that border crossing is far better organized.
Another interesting curiosity is how all Thai officials (and I understand most if not all Burmese ones too) are masked up at the Mae Sai crossing, but at the Golden Triangle (Sob Ruak, Chiang Saen) none, or at least of them are.
It makes Mae Sai feel like it's in a state of crisis, whereas the Golden Triangle is relaxed and largely back to normal.