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Ramkhamhaeng University Tennis Court
Added by Joris
Again a university where you can play. Affordable price here, but the surface is quite fast and there is barely any shade on the courts which you seek in the breaks during daytime. To pay or to ask questions you have to go into the building sidewards of the courts. That entrance is wide and open, so you will notice it. Inside, walk to the left and open the door. There is small table with someone who can help you.
You can buy drinks on 1 minute walking distance at an open food market.
An option to consider when you live around Ramkhamhaeng.