Also to Vientianne in Laos, via Nong Khai.
In those days, to avoid the long queues at the Thai Embassy, you could employ the services of a Laos agent, several of whom were parked with their white vans opposite the Embassy. For 1,000 baht he completed all the paperwork. You left your passport with him and retired to a pre-arranged hotel. The next day around 11am, he would present your passport at hotel reception with the new visa - EASY! I had no qualms about leaving my passport as it was a very lucrative business for the Laotians which they did not want to upset.