PC Nigel Bird, who led the Trehafod BMX bike track initiative, said it had brought "a massive improvement to the area", with a 70 percent cut in anti-social behaviour locally.
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Rain clipping the far north through the evening but elsewhere staying dry with some sunny spells.
Public Health Wales figures show 25 more cases of the virus have also been confirmed.
Photos taken on Saturday morning show Roald Dahl Plass strewn with empty beer bottles and discarded canisters of laughing gas.