I worked in Udorn as a tech rep on defense contracts from 1966-68 and 1971-74. I can recall a bowling alley and the Trunk Room in that area on Amphur Road, one of the few places in town where you could get a pizza back then. Here is an old USAF map from 1968 that shows the Trunk Room location:http://www.tlc-brotherhood.org/udornmap68.jpg
Not much is still recognizable from those days but there are still three traffic circles (roundabouts). The map also shows the Wolverine Bar/Restaurant which is still open. Oscar's Massage, not on the map, is still running. Udorn Hotel is still open as well as Sriudorn Hotel which is pretty run down these days. The Paradise and Charoen Hotels were built a few years later than 1966. I remember the Tip Top Bar being located in downtown Udorn on Prajak Road but a few others who have posted in here say it was just outside of the airbase. Can't really say what happened to these places but probably shut down after the US military left around 1976. Might be some veterans here now who can remember, members of the Udorn VFW or TLC-Brotherhood (I'm a former member of the TLC-B) come to mind.
If you haven't already checked out some of the old pictures on the TLC-Brotherhood site, worth a look:http://www.tlc-brotherhood.org/pictures.html