I'm hoping to spend ~4 weeks in Isaan for my next Thailand trip and am curious on what the best way to logistically explore the area is.
Cities on my list are Udon, Ubon, Korat, Khon Kaen, Roi Et, and Nong Khai. I've been to Udon Thani and understand to really see Isaan, I need to leave the cities and explore the villages. I plan to get an IDL and rent a car for this purpose.
I looked up a ~4 week rental on Budget and Hertz and the quotes are in the range of 35,000 THB ... yikes. Is the recommendation to use transit (fly, bus, train) to go between the cities, use the cities as hubs, and rent a car to leave the cities?
Please also comment if you think I should add other areas to my itinerary or skip over some of the cities listed.