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I think it costs 60-90 baht to skate it for an afternoon/evening (I can't quite remember the exact price but it's pretty damn reasonable) and they have boards for hire available which are actually pretty sweet. The pictures are pretty average, the bowl is tight and small but still fun and the Euro is super nice. There's the standard rails and ledges and even a marble manual pad and bank. This place is also air-conditioned! You have no idea what a relief that is until you try to start skating in Bangkok.
'Esplanade' Shopping Mall , Bangkok. This has gotta be the best place I found to skate in Bangkok. You take the subway to the Thailand Cultural Centre station. The mall is basically right above the station. There's only one subway (or Metro) line in Bangkok, the other's are all skytrains, so this is really easy to find. The skatepark is inside the mall on the ground floor, look for the shop with the Emily the Strange pictures in the front window. Walk in there and there's like 5 'street wear' shops and Preduce is located near the back.