Jok Somphet used to be a regular venue of mine (it changed locations and used to be on the corner). It is open all night, so you would always see drunk people come and go in the small hours lol. Some funny people watching could be had.
I tend not to go into the main city anymore and Jok Somphet sort of became a bit more touristy (or well, the area did in general).
Have some fond memories of there though :)