Best Thai cooking school(s) in Krabi Province?

I have a freind who will be spending a week in Railay, Koh Lanta, Ao Nang and Krabi Town next month, and is interested in attending a Thai cooking school. I am aware of quite a few schools in the area, but am no cook and don't have time to do much personal research. I would appreciate any reviews/recommendations of schools you have had a good experience with. I realize this is pretty subjective, but at least my friend will have a starting point for making a choice. The choice of a school will also determine where and for how long she stays in the above locations. Many thanks in advance for your help!