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Ramkhamhaeng University Tennis Court
Again a university where you can play without having to graduate.
A more than affordable price here (80thb per hour) but the surface is pretty fast and there is barely any shade on the courts which you seek during daytime breaks. 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. Staff should be present here.
You can buy drinks on 1 minute walking distance at an open food market.
An option to consider when you live around Ramkhamhaeng.