In may I will be coming to Korat city city for a weeks intensive thai course. As it is one to one I won't have other students around.

Can residents recommend places to go for a drink in the evening. Thai or farang places. I don't know the city at all

I suggest joining the Expat of Korat page on Facebook. They provide excellent, up to date insight to what you are looking for.

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Go to koratfarang,you'll get straight there