Its quiet hard to find if you haven't been there before. The best way to explain it to a friend or someone (who should take you) would be to go to major ratcheotin, and follow the main road coming from the airport highway all the way down until you run into military bases. Hopefully who you are with will know which one and the right entrance. Good luck!
This is by far my favorite field in Thailand, the staff are friendly (especially P'Ae the owner/avid player) the field set up is different every week and their bunkers are head and shoulders above some of the other fields here.
This place is more for experienced players as there tends to be a lot on Sundays. Last weekend we had about 5 full teams there and 5 or 6 other people who turned up wanting to play. We are rarely interrupted by walk ons and P'Ae keeps the play fair and fun. You will most likely see him on the field all day filling in spots where players are missing (he is a total machine made respect for him haha), and I rarely see him off the field if play is going on.
There is a good pro shop there and facilities for food drinks, it is really chipped and layed out nicely. The refs are very good and the competition is excellent. Most definitely recommended for players seeking some fun while in the Kingdom. More information about our scene can be found by searching pbthailand and seeking out the weekend warriors forum.