This sounds like a local fixer job for TV programs. I am familiar with this which I have done several times for Danish TV production houses.
Apart from being suitable, it is important in Thailandf to obtain the permission to do the shoot on the location, which is what has been part of our previous assignments.
I understand there is a certain amount of confidentiality involved and that this is probably why you at this time do not disclose more about the project. I would like to chat a bit about the project and maybe I can give you some good advice - after all I have been living in Thailand and working as a journalist for over 30 years.
You should for example be aware, that the cost involved like transportation, meals, etc. should be agreed in advance before you accept the lowest bid - because it is easy to compensate a low bid by pumping up out-of-pocket costs.
I would be happy to help. My quote is my usual full day rate - but maybe the location surcvey doesn't take a full day?
Best regards
Gregers Moller