Gravel rides around Cardiff?

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Going to be in Cardiff for the long weekend, got a nice gravel bike (Creo) and really enjoyed some rides around Scotland last Easter on what I think is gravel roads?

Currently the bike has 28mm Gravelking tires, don’t really want to go out and buy bigger tiers 24hrs before travelling but could be persuaded if the right routes need them.

Any suggestions for off road routes around Cardiff area/