Thank you, Yannawa. I will certainly keep your suggestions in mind
I will be travelling with my Thai bf, and 2 other Thai friends. They are not familiar with the vast Isarn plateau, but are eager to explore the sights, the ancient ruins, the Khmer temples, national parks, wineries and vineyards, scenic places, etc etc. With my bf in tow, I don't think I can visit the saunas etc you have mentioned. For us, it's more like a cultural tour.
If there is already some itinerary or suggestions on how to spend 10 to 14 nights in Isarn (eg. where to stay each night, what to do, where to go), then I need not "re-invent the wheel" so to speak, in planning my journey.