When & Where? 
Runs start at 4:30pm and should be (there are exceptions) within a one-hour drive of central Bangkok. Hares will attempt to make a 60-90 minute trail (ideally between 6-8km), bearing in mind that runs through shiggy typically plod along at a slow pace. Stay off concrete as much as possible, but hashers seem to love klong path trails.
It is not desireable for hashers to be on trail after dark, so please adhere to reasonable trail lengths for safety sake. Also, Bangkok and its environs are very hot, even in the shade, and hashers usually only have the water they carry from the beginning of the trail. Please clearly mark hazards, especially rusty barbed wire if the trail passes by or through.
Checks should be clearly marked with an 'X'. Use many checks to try to keep the pack together. While there is no mandate for the number of checks used, every 1km or so is a good guideline. The trail should be found within 100 meters of the check. Hashers can use shredded paper and/or chalk to break checks. Hares please provide a few hashers with chalk for breaking checks if appropriate. Also, please leave extra shredded paper at checks for breaking them.
When laying the first paper after the check, put second paper down after 3-5 meters. Put a third paper down after 3-5 more meters. There is nothing worse than missing the first paper when solving a check and then having to run 40 more meters before more paper appears. When laying paper after a check, make sure everyone can see it.
Try to have some consistency in placing marks. Paper at eye level is easiest to see. Use bushes and trees when possible. Use chalk to write on vertical walls.
When it rains put more paper than normal because it can and will get washed away.
Please provide detailed instructions regarding marks and potential dangers at the beginning of the run in the circle.

Check a weather website (http://www.weather.com/weather/right-now/THXX0002:1) for potential rainstorms and use lots of shredded paper. Thick paper is less likely to be washed away in the rain.
Use Google Earth and Google Maps to help your trail set.