Mr.JR, I am sure you are going to have a memorable trip.
As those who have posted above have written, give it a try, but be cautious.
Read up as much as you can on such topics as Thai girlfriends, Thai culture, and perhaps more important of all, read about other's foreigner's experiences with Thai women. Unfortunately, those who are easiest to find are neither representative of Thai women in general, nor are they the kind you are probably hoping to meet. Its kind of a natural law.
I have referred some friends to the
www.stickmanbangkok.com website and
www.thai360.com forum for this kind of information. Udomap.com is pretty good for information about Udon, but there are far more stories about guys who met the wrong kind of girl on those other two web sites, maybe because many on udonmap.com have already been through most of their bad experiences.
In particular, I think you will find the reader submission on the stickmanbangkok site to be informative.
http://www.stickmanbangkok.com/Stickman ... ssions.htm
Beyond that, the best thing you can to do make sure that this experience results in maximum good and the minimum bad, is to share your experiences with a friend. Somebody who you can bounce thoughts off of, and preferably, one who has been around Thailand for a few years. Though it hasn't been said outright, what we are worried about is the possibility of your being sucked into a scam, much larger than Mainer's taking the whole village to dinner (by the way, this is common and not necessarily a scam.) Only by bouncing your thoughts and perceptions off somebody, can you hope to avoid a huge scam, if this is what your situation turns out to be.
There is a good chance that this is merely an unmarried woman, looking for a way to make her family's and her life better by making contact with a foreigner, and you are the lucky candidate, and it all might work out really well.
May it truly turn out to be a blessing for all of you.